Engineering

This article discusses about adiabatic turbine. The term adiabatic is often used in the field of thermodynamics. It refers to a system or boundary which does not allow heat transfer to take place.

A turbine is an essential device used in power plants which assists in generation of electricity. It contains elements that rotate. This rotation is transferred to generator which generates the electricity. We will study more about adiabatic turbines in this article.

What is an adiabatic system?

The system from which transfer of heat is restricted is called as adiabatic system. That is the heat cannot be transferred to surroundings and the heat cannot enter the system from surroundings.

The net heat transfer is zero. This is because of the walls of the system are adiabatic. Heat is not allowed to be transferred from the system. The entire content of heat remains inside the system only which becomes the internal energy of the system.

What is a turbine?

A mechanical device that is used to convert hydraulic energy to mechanical energy is called as turbine. The hydraulic energy comes in the form of moving water/steam which hits the propellers of turbine.

The movement of fluid that is the kinetic energy of fluid is transferred to the propellers of turbine. Because of this reason the shaft of turbine start rotating. This way the conversion of energy takes place from hydraulic to mechanical. Further sections will tell us more about turbine in detail. 

Working of turbine

After discussing in the above section we now know that the turbine converts kinetic energy of fluid to mechanical energy.

In power plants, steam is used as the working fluid and in dams water is used as the working fluid. Working fluid here refers to the fluid which is responsible for rotation of shaft. The shaft rotates after working fluid strikes the surface of propeller. The rotating shaft is connected to generator which generates electricity.

What is adiabatic turbine?

Now we know the meanings of both adiabatic system and turbine. Let us see what is an adiabatic turbine.

An adiabatic turbine is a turbine whose walls are adiabatic. These walls don’t allow heat transfer through them. This way no amount of heat can escape the turbine. Hence, the net transfer from the turbine is zero. No heat is added to the turbine and no heat escapes the turbine when the turbine is adiabatic.

Adiabatic turbine working

We know what an adiabatic turbine is. We can see that there is no physical difference between a normal turbine and an adiabatic turbine, only difference between them is that adiabatic turbine does not allow heat transfer to take place.

Similarly, the working of an adiabatic turbine is also same as that of normal turbine. In almost all cases, the walls of the turbine are kept adiabatic. Hence the working of an adiabatic turbine is same as that of a normal turbine that we have discussed in above sections.

Adiabatic gas turbine

As we have studied about the turbines used dams, they use water as the working fluid that rotates the propeller shaft in turbines.

When the working fluid used is a gas then the turbine is called as gas turbine. Gas turbines are mostly used in aeroplane power plants and thermal power plants used for generating electricity. The materials used in both the turbines are different because the type of working fluid used is different.

Adiabatic steam turbine

Adiabatic steam turbine is a turbine in which steam is used as the working fluid. Steam as we all know is the gaseous form of water.

The steam contains high kinetic energy which is transferred to the propeller of turbine. The turbine rotor starts moving when the high energy steam strikes the surface of propeller. Pressure drop will take place inside the turbine, while entering the steam is at high pressure. This pressure drops and the steam becomes low pressure steam after passing through turbine. 

Adiabatic reversible turbine

The term reversible refers to a turbine in which all the processes are ideal. The losses de to friction or energy leaks are not present in reversible processes.

When we talk about adiabatic reversible turbine, it means the expansion process taking place inside the turbine is nearly ideal. Usually a multiple staged turbine is considered as a reversible turbine. When the walls are adiabatic, this turbine becomes adiabatic reversible turbine.

Adiabatic turbine equation

The equation used in adiabatic turbine is given below-

Work done by turbine is given by-

Wt= h2-h1

Where,

h2 is the enthalpy at point 2

h1 is the enthalpy at point 1

Adiabatic turbine efficiency

The efficiency is defined as the output gained from a system or device after pumping in some input.

The efficiency of adiabatic turbine is given as-

Efficiency= Output/Input = Wt/Qa

Where,

Wt is the work done by turbine

Qa is the amount of heat added in the system

Is a turbine reversible ?

We have already discussed in above section that a turbine is considered reversible when the expansion process in the turbine is ideal.

In reality, no device can be considered ideal, but a turbine can be made nearly ideal by increasing the number of stages of expansion process. This type of turbine is called as a multi staged turbine. The process of using multiple turbines is called as reheating.

Is a steam turbine adiabatic?

When the transfer of heat is restricted completely, a steam turbine can be said to be adiabatic.

The steam changes its phase to liquid after passing through the condenser. In a turbine only the pressure drop in steam takes place. The steam coming in with high pressure gets converted to a low energy steam at exit.

Image credits: Siemens Pressebild, Dampfturbine Montage01, CC BY-SA 3.0

Why are turbines adiabatic?

Turbines are adiabatic as the entire energy is taken to drive the turbine shaft.

No energy is lost in the form of heat or no energy enters the turbine in the form of heat. The only energy that participates in the energy transfer process is the kinetic energy of the fluid and kinetic energy of the turbine rotor.

Adiabatic turbine entropy

Before discussing about adiabatic turbine’s entropy, we shall know the meaning of entropy. Entropy’s widely accepted definition says that it is a measure of randomness in the system.

In actual turbines the entropy value increases. Whereas for reversible adiabatic processes the value of entropy generated is zero. This is because entropy is a state function and for a reversible process the end points are same and as the process is adiabatic, due to no heat transfer the change in entropy is zero.

Introduction to Back Work Ratio

The back work ratio is a crucial parameter in the field of thermodynamics, specifically in the study of gas and steam turbines. It provides valuable insights into the efficiency and performance of these machines. In this section, we will delve into the definition of the back work ratio and explore the formula used to calculate it.

Definition of Back Work Ratio

The back work ratio is a measure of the amount of work required to operate a turbine compared to the work it produces. It is expressed as a ratio and is an essential factor in determining the overall efficiency of a turbine.

In a gas or steam turbine, the back work ratio represents the portion of the work output that is used to drive the compressor or pump. This work is necessary to maintain the required pressure ratio and ensure the continuous operation of the turbine.

A high back work ratio indicates that a significant portion of the turbine’s power output is used to drive the compressor or pump, resulting in lower overall efficiency. Conversely, a low back work ratio signifies that a smaller proportion of the power output is consumed by these components, leading to higher efficiency.

Formula for Back Work Ratio

The back work ratio can be calculated using the following formula:

Back Work Ratio = (Work Input - Work Output) / Work Output

To understand this formula better, let’s break it down:

• Work Input: This refers to the amount of work required to operate the turbine. It includes the work needed to drive the compressor or pump, as well as any other external work input.

• Work Output: This represents the actual work produced by the turbine. It is the net power output available for useful work, such as generating electricity or driving machinery.

By subtracting the work output from the work input and dividing it by the work output, we obtain the back work ratio. This ratio provides a quantitative measure of the energy losses within the turbine system.

It is important to note that the back work ratio is influenced by various factors, including turbine efficiency, compressor efficiency, pressure ratio, and isentropic efficiency. These parameters play a significant role in determining the overall performance and effectiveness of the thermodynamic cycle.

In the next sections, we will explore each of these factors in more detail and understand their impact on the back work ratio.

Back Work Ratio in Gas Turbine Engines

The back work ratio is an important parameter that measures the efficiency of a gas turbine engine. It represents the amount of work required to drive the compressor compared to the work produced by the turbine. In other words, it quantifies the energy losses within the engine.

Reasons for Relatively High Back Work Ratio

There are several factors that contribute to a relatively high back work ratio in gas turbine engines. Understanding these reasons is crucial for optimizing the performance of these engines.

1. Compressor Efficiency: The efficiency of the compressor plays a significant role in determining the back work ratio. A less efficient compressor requires more work to achieve the desired pressure ratio, resulting in a higher back work ratio.

2. Pressure Ratio: The pressure ratio, which is the ratio of the compressor outlet pressure to the inlet pressure, also affects the back work ratio. Higher pressure ratios generally lead to higher back work ratios.

3. Isentropic Efficiency: The isentropic efficiency of the compressor and turbine stages impacts the back work ratio. Lower isentropic efficiencies result in higher back work ratios, as more work is required to compensate for the energy losses.

Typical Back Work Ratio Values for Gas Turbine Engines

The back work ratio values for gas turbine engines can vary depending on various factors such as engine design, operating conditions, and specific applications. However, there are some typical ranges that can be observed.

1. Aircraft Gas Turbines: In aircraft gas turbines, the back work ratio is usually in the range of 0.3 to 0.5. These engines are designed to prioritize power output and fuel efficiency, which leads to relatively lower back work ratios.

2. Industrial Gas Turbines: Industrial gas turbines, used in power generation and other industrial applications, tend to have higher back work ratios. Typical values for these engines range from 0.5 to 0.8. The higher back work ratios are often a result of the need for higher power output and efficiency.

3. Combined Cycle Power Plants: Gas turbines used in combined cycle power plants, where the exhaust gases are used to generate steam for a steam turbine, have lower back work ratios compared to standalone gas turbines. The back work ratio for these systems can range from 0.2 to 0.4.

It’s important to note that these values are general guidelines and can vary depending on specific engine configurations and operating conditions.

In conclusion, the back work ratio is a critical parameter in gas turbine engines that measures the efficiency of the engine. Understanding the reasons for a relatively high back work ratio and typical values for different types of gas turbines can help engineers and operators optimize the performance of these engines. By focusing on improving compressor efficiency, pressure ratio, and isentropic efficiency, it is possible to reduce the back work ratio and enhance the overall efficiency of gas turbine engines.

Back Work Ratio in Brayton Cycle

The back work ratio is an important parameter in the Brayton cycle, which is a thermodynamic cycle commonly used in gas turbine engines. It quantifies the amount of work required to drive the compressor compared to the work output of the turbine. In this section, we will explore the explanation of the Brayton cycle and the formula used to calculate the back work ratio.

Explanation of Brayton Cycle

The Brayton cycle is a thermodynamic cycle that describes the operation of a gas turbine engine. It consists of four main processes: compression, combustion, expansion, and exhaust. Let’s take a closer look at each of these processes:

1. Compression: In this process, the air is drawn into the compressor and compressed to a higher pressure. The compressor plays a crucial role in increasing the pressure of the air before it enters the combustion chamber.

2. Combustion: Once the air is compressed, it is mixed with fuel and ignited in the combustion chamber. The combustion process releases a large amount of heat, which increases the temperature and pressure of the working fluid.

3. Expansion: The high-pressure, high-temperature gas from the combustion chamber is expanded in the turbine. As the gas expands, it loses energy, which is converted into mechanical work to drive the turbine and any attached load, such as an aircraft engine or a power generator.

4. Exhaust: After the expansion process, the gas is exhausted from the turbine. It may still contain some energy, but it is typically at a lower pressure and temperature compared to the gas entering the turbine.

The Brayton cycle is often referred to as an ideal cycle, assuming certain ideal conditions such as no losses due to friction or heat transfer. However, in real-world applications, these losses are inevitable and can impact the overall efficiency of the cycle.

Back Work Ratio Formula in Brayton Cycle

The back work ratio (BWR) is defined as the ratio of the work required to drive the compressor to the work output of the turbine. It is an essential parameter in determining the overall efficiency of the gas turbine engine. The formula to calculate the back work ratio is as follows:

BWR = (Work Input to Compressor) / (Work Output of Turbine)

The work input to the compressor is the energy required to compress the air, while the work output of the turbine is the energy produced by the expansion of the high-pressure gas. By comparing these two values, we can determine the efficiency of the Brayton cycle.

A high back work ratio indicates that a significant portion of the turbine’s output work is used to drive the compressor, resulting in lower net power output. Conversely, a low back work ratio implies that the turbine is more efficient, as less work is required to drive the compressor.

It is important to note that the back work ratio is influenced by various factors, including the efficiency of the compressor and turbine, the pressure ratio across the compressor and turbine, and the isentropic efficiencies of these components. Optimizing these factors can help improve the overall efficiency of the Brayton cycle.

In conclusion, the back work ratio is a crucial parameter in the Brayton cycle, as it quantifies the efficiency of the gas turbine engine. By understanding the explanation of the Brayton cycle and the formula to calculate the back work ratio, engineers and designers can make informed decisions to optimize the performance of gas turbine systems.

Back Work Ratio in Rankine Cycle

Explanation of Rankine Cycle

The Rankine Cycle is a thermodynamic cycle commonly used in power plants to generate electricity. It is a closed-loop cycle that utilizes both a heat source and a heat sink to convert heat energy into mechanical work. The cycle consists of four main components: a boiler, a turbine, a condenser, and a pump.

The process begins in the boiler, where heat is added to the working fluid, typically water, to convert it into high-pressure steam. This high-pressure steam then enters the turbine, where it expands and does work by driving the turbine blades. As the steam expands, its pressure and temperature decrease.

After leaving the turbine, the low-pressure steam enters the condenser, where it is cooled and condensed back into liquid form. This condensation process releases heat, which is transferred to a cooling medium, such as water from a nearby river or ocean. The condensed liquid is then pumped back to the boiler to repeat the cycle.

Back Work Ratio Formula in Rankine Cycle

The back work ratio (BWR) is a parameter used to evaluate the performance of a Rankine Cycle. It represents the ratio of the work required to operate the pump to the net work output of the turbine. Mathematically, it can be expressed as:

BWR = (Work input to pump) / (Net work output of turbine)

The work input to the pump is the energy required to increase the pressure of the working fluid from the condenser pressure to the boiler pressure. This work input is typically expressed in terms of kilojoules per kilogram (kJ/kg) of the working fluid.

On the other hand, the net work output of the turbine is the difference between the work done by the turbine and the work done by the pump. The work done by the turbine is the energy extracted from the steam as it expands in the turbine, while the work done by the pump is the energy required to increase the pressure of the working fluid.

The back work ratio is an important parameter because it indicates the efficiency of the Rankine Cycle. A lower back work ratio implies a more efficient cycle, as less work is required to operate the pump relative to the work output of the turbine. Conversely, a higher back work ratio indicates a less efficient cycle, as more work is needed to operate the pump.

In practice, engineers strive to minimize the back work ratio by optimizing the design and operation of the Rankine Cycle. This can be achieved by using efficient pumps and turbines, maximizing the temperature difference between the heat source and heat sink, and reducing losses due to friction and heat transfer.

By carefully considering the back work ratio, engineers can improve the overall efficiency and performance of power plants that utilize the Rankine Cycle. This, in turn, leads to reduced energy consumption and lower environmental impact.

Back Work Ratio in Otto Cycle

The back work ratio is an important parameter in the Otto cycle, which is a thermodynamic cycle commonly used in internal combustion engines. It helps us understand the efficiency of the cycle and the amount of work required to operate the engine. In this section, we will explain the Otto cycle and discuss the formula for calculating the back work ratio.

Explanation of Otto Cycle

The Otto cycle is a theoretical thermodynamic cycle that describes the operation of a typical gasoline engine. It consists of four processes: intake, compression, combustion, and exhaust. During the intake process, the fuel-air mixture is drawn into the cylinder. In the compression process, the mixture is compressed to increase its temperature and pressure. The combustion process involves the ignition of the compressed mixture, resulting in a rapid expansion of gases and the generation of power. Finally, in the exhaust process, the burned gases are expelled from the cylinder.

The Otto cycle is an idealized representation of the actual engine operation, assuming certain ideal conditions such as perfect combustion, no heat loss, and ideal gas behavior. Despite these simplifications, the Otto cycle provides a useful framework for analyzing engine performance.

Back Work Ratio Formula in Otto Cycle

The back work ratio (BWR) is defined as the ratio of the work required to operate the engine’s auxiliaries (such as the compressor and the pump) to the net work output of the engine. It is an indicator of the efficiency of the cycle and is typically expressed as a percentage.

The formula for calculating the back work ratio in the Otto cycle is:

BWR = (Work Input to Compressor + Work Input to Pump) / Work Output of Engine * 100

The work input to the compressor is the work required to compress the air-fuel mixture during the compression process. It is influenced by factors such as the compression ratio and the efficiency of the compressor. The work input to the pump is the work required to circulate the coolant or lubricant in the engine. It depends on the flow rate and the pressure difference across the pump.

The work output of the engine is the net work produced during the power stroke of the combustion process. It is influenced by factors such as the pressure ratio, the isentropic efficiency of the combustion process, and the mechanical efficiency of the engine.

By calculating the back work ratio, engineers can assess the efficiency of the engine’s auxiliaries and identify areas for improvement. A high back work ratio indicates that a significant portion of the engine’s power is consumed by the auxiliaries, reducing the overall efficiency of the system. On the other hand, a low back work ratio suggests that the auxiliaries are operating efficiently, allowing more power to be delivered to the output.

In conclusion, the back work ratio is an important parameter in the Otto cycle, providing insights into the efficiency of the engine’s auxiliaries. By understanding and optimizing the back work ratio, engineers can enhance the overall performance of internal combustion engines.

Significance of Back Work Ratio

The back work ratio is an important parameter in the field of thermodynamics, specifically in the study of gas turbines and steam turbines. It plays a crucial role in determining the overall efficiency and performance of these power generation systems. In this section, we will explore the importance of the back work ratio and how it is calculated.

Importance of Back Work Ratio

The back work ratio is a measure of the energy required to drive the compressor or the pump in a thermodynamic cycle. It represents the fraction of the work output that is used to overcome the losses in the turbine or the compressor. A low back work ratio indicates that a significant portion of the work output is consumed by these losses, resulting in reduced overall efficiency.

One of the key reasons why the back work ratio is significant is its direct impact on the efficiency of the turbine. The back work ratio affects both the turbine efficiency and the overall power output of the system. A higher back work ratio means that more energy is required to drive the compressor or the pump, resulting in a decrease in the net power output of the turbine.

Additionally, the back work ratio also influences the pressure ratio and the isentropic efficiency of the compressor or the pump. These parameters are crucial in determining the performance of the entire thermodynamic cycle. A higher back work ratio leads to an increase in the pressure ratio, which can have a positive effect on the overall efficiency of the system.

Furthermore, the back work ratio is closely related to the efficiency of the turbine. By minimizing the losses in the turbine or the compressor, the back work ratio can significantly improve the overall efficiency of the system. This is particularly important in power generation applications, where even a small increase in efficiency can result in substantial cost savings and environmental benefits.

Calculation of Back Work Ratio

The back work ratio can be calculated using the following formula:

Back Work Ratio = (Work Input - Work Output) / Work Output

To calculate the back work ratio, we need to determine the work input and the work output of the system. The work input represents the energy required to drive the compressor or the pump, while the work output represents the useful work produced by the turbine.

In a gas turbine, the work input is typically calculated by measuring the power input to the compressor, while the work output is determined by measuring the power output from the turbine. Similarly, in a steam turbine, the work input is calculated based on the enthalpy change of the steam, while the work output is determined by measuring the power output from the turbine.

Once we have the values for the work input and the work output, we can substitute them into the formula to calculate the back work ratio. The resulting value provides us with a quantitative measure of the energy losses in the turbine or the compressor.

In conclusion, the back work ratio is a significant parameter in the study of gas turbines and steam turbines. It directly influences the efficiency and performance of these power generation systems. By understanding the importance of the back work ratio and how to calculate it, engineers and researchers can optimize the design and operation of turbines to achieve higher efficiency and improved performance.
Conclusion

In conclusion, the back work ratio is a crucial metric that helps measure the efficiency of a heat engine or a refrigeration system. It indicates the amount of useful work output obtained from a system compared to the amount of work input required to operate it. A higher back work ratio signifies a more efficient system, as it indicates that a larger proportion of the input energy is converted into useful work. On the other hand, a lower back work ratio suggests that a significant portion of the input energy is lost as waste or used to operate auxiliary components. By optimizing the back work ratio, engineers and designers can improve the overall performance and energy efficiency of various systems, including power plants, engines, and refrigeration units. It is important to consider the back work ratio when evaluating and comparing different systems, as it provides valuable insights into their energy conversion capabilities. By understanding and optimizing the back work ratio, we can strive towards more sustainable and energy-efficient technologies that minimize waste and maximize the utilization of available resources.

Frequently Asked Questions

Q: Why are the back work ratio relatively high in gas turbine engines?

A: Gas turbine engines have relatively high back work ratios because a significant portion of the work produced by the turbine is used to drive the compressor, resulting in a higher energy requirement for the overall operation of the engine.

Q: What are typical back work ratio values for gas-turbine engines?

A: Typical back work ratio values for gas turbine engines can vary depending on the specific design and operating conditions. However, values between 0.3 and 0.5 are commonly observed in practice.

Q: What is back work ratio?

A: Back work ratio is a thermodynamic parameter that represents the ratio of work required to drive the compressor to the work produced by the turbine in a thermodynamic cycle. It is an indicator of the efficiency of the overall cycle.

Q: What is the back work ratio of this cycle?

A: The back work ratio of a specific cycle depends on the design and operating conditions of the system. It can be calculated by dividing the work required to drive the compressor by the work produced by the turbine.

Q: What is back work ratio in Brayton cycle?

A: In the Brayton cycle, the back work ratio represents the ratio of work required to drive the compressor to the work produced by the turbine. It is an important parameter that affects the overall efficiency of the cycle.

Q: What is back work ratio formula?

A: The formula to calculate the back work ratio is: Back Work Ratio = Work Required to Drive Compressor / Work Produced by Turbine.

Q: What is back work ratio of gas turbine?

A: The back work ratio of a gas turbine represents the ratio of work required to drive the compressor to the work produced by the turbine. It is an important parameter that affects the efficiency and performance of the gas turbine.

Q: What is back work ratio in thermodynamics?

A: In thermodynamics, back work ratio is a parameter that measures the efficiency of a thermodynamic cycle. It represents the ratio of work required to drive the compressor to the work produced by the turbine.

Q: What is turbine efficiency?

A: Turbine efficiency is a measure of how effectively a turbine converts the energy of a fluid (such as gas or steam) into mechanical work. It is typically expressed as a percentage and is influenced by factors such as design, operating conditions, and losses.

Q: What is compressor efficiency?

A: Compressor efficiency is a measure of how effectively a compressor increases the pressure of a fluid. It is typically expressed as a percentage and is influenced by factors such as design, operating conditions, and losses.

In our surroundings most of the flows of the viscous fluids are examples of turbulent flow. Examples of turbulent flow mainly flow via very small size ways and the flow will be slower than the regular.

12+ Examples of Turbulent Flow is listed below,

• Flow of the lava
• Flow of the blood in arteries
• Transpiration of oil through the pipelines
• Flow in the wake of the boat
• Aircraft wing tips
• Currents in the atmosphere
• Currents in the ocean
• Smoke
• Car exhaust
• Rivers
• Air flow through the air conditioning system
• Windmill

What is the meaning of turbulent flow?

Turbulent flow mainly occurs when excessive amount of kinetic energy is present in the flow of motion in the fluids. By the help of Reynolds number the flow of turbulent can be easily determined in the fluid.

Turbulent flow can be explain as, the fluid or in turbulent water  an unbalanced situation is appear in restlessness or compound of two or than two liquid substance. For the reason of the restlessness of the fluid the velocity, pressure and other physical parameters are not same at the each point of the fluid.

If the value of the Reynolds number is more than 3500 then the type of fluid known as turbulent flow.

In which factors the flow of the turbulent is dependent?

The factors the flow of the turbulent is dependent is listed below,

• Velocity
• Viscosity
• Pressure

The factors are briefly discuss,

Velocity:

The flow of turbulent is depends on the physical property of velocity. The relationship with the flow of turbulent and velocity is proportional to each other. Means if the rate of velocity is increases then the value of flow of turbulent is also increases and if the rate of velocity is decreases then the value of flow of turbulent is also decreases.

Viscosity:

The flow of turbulent is depends on viscosity. The relationship with the flow of turbulent and viscosity is indirectly proportional to each other. Means if the rate of viscosity is increases then the value of flow of turbulent is decreases and if the rate of viscosity is decreases then the value of flow of turbulent is increases.

Pressure:

Another parameter where the flow of turbulent is depends that is pressure. The relationship with the flow of turbulent and pressure is directly proportional to each other. Means if the rate of pressure is increases then the value of flow of turbulent is also increases and if the rate of pressure is decreases then the value of flow of turbulent is also decrease in the same way.

12+ Examples of Turbulent Flow facts are broadly discuss in below,

Flow of the lava:

In the flow of the lava turbulent flow is appearing. If we observe the flowing condition of the lava then we easily can observe that when lava is came out from the inside of the earth to the surface of the earth that time the particles are not flow in a directional motion the layers of the lava is mixing with each other for this particular reason the physical parameters like velocity, pressure, viscosity is not remain same at each of the molecules of the fluid.                

Flow of the blood in arteries:

In the flow of the blood in arteries the flow of turbulent is present. If we observe the flowing condition of the blood then we easily can observe that when blood is flow through the arteries the particles are not flow in a directional motion. The layers of the blood is mixing with each other for this particular reason the physical parameters like velocity, pressure, viscosity is not remain same at each of the molecules of the fluid and turbulent flow appear.

Transpiration of oil through the pipelines:

In the transpiration of oil through the pipelines flow of turbulent is present. If we observe the flowing condition of fluid then we easily can observe that when fluid is flow through the pipes the particles are not flow in a directional motion.

Flow in the wake of the boat:

In the flow in the wake of the boat the flow of turbulent is present. The flowing condition of fluid is directional motion and the physical parameters like velocity, pressure, viscosity is not remain same at each of the molecules of the fluid and turbulent flow appear.

Aircraft wing tips:

In aircraft wing tips the flow of turbulent is present. The physical parameters like velocity, pressure, viscosity is not remain same at each of the molecules of the fluid and turbulent flow appear.

Currents in the atmosphere:

In the currents of the atmospheric the presence of the turbulent flow can be observe.

Currents in the ocean:

In the currents of the oceans the flow of turbulent is present. The physical parameters like velocity, pressure, viscosity is not remain same at each of the molecules of the fluid and turbulent flow appear.

Smoke:

In the smoke of turbulent is present. When smoke is mix with the surrounding the physical parameters like velocity, pressure, viscosity is not remain same at each of the molecules of the fluid and turbulent flow appear.

Car exhaust:

In the flow of the car exhaust flow of turbulent is present. When smoke is emitted from the vehicle smoke is mix with the surrounding the physical parameters like velocity, pressure, viscosity is not remain same at each of the molecules of the fluid and turbulent flow appear.

Rivers:

In river water the layers are mix with each other and turbulent flow is present.

Read more about Mass Flow Rate : Its Important relations and FAQs

Air flow through the air conditioning system:

In air flow of ac turbulent is present because the layers are not flow in one direction.

Windmill:

In windmill flow of turbulent is present. When windmill start the surrounding air mix up a turbulence is appear.

Read more about Wind Turbine Efficiency : Complete Insights and FAQs

Frequent Asked Question:-

Question: – Describe the relation between Reynolds number and flow of the fluid.

Solution: – Reynolds number is dimensionless physical factor. By the using Reynolds number easily can estimate the type of the flow of viscous fluid. The Reynolds number easily can understand us the flow is laminar or turbulent.

The relation between Reynolds number and flow of the fluid is given below,

Where,

R_e = Reynolds number

ρ = Density for the viscous fluid

V = Characteristic velocity for the viscous fluid

L = Characteristic length for the viscous fluid

μ = Dynamic viscosity for the viscous fluid

v = Kinematic viscosity for the viscous fluid

The change of state middle of the dynamic viscosity and kinematic viscosity is given below,

v = μ/ρ

Reynolds number:-

Reynolds number can be deriving as the ratio between the inertia force and viscous force.

Mathematically Reynolds number can be written as,

R_e =ρuL/μ

Where,

R_e = Reynolds number

ρ = Density of the viscous fluid

u = Speed of flow of the viscous fluid

L = Characteristics linear dimension of the viscous fluid

μ = Dynamic viscosity of the viscous fluid

With the help of Reynolds number we can estimate several properties of the fluid such as viscosity, velocity, length, pressure and many others.

Read more about Reynolds number : It’s 10+ Important facts

Question: – Write the major difference between flow of laminar and flow of turbulent.

Solution: – The major difference between flow of laminar and flow of turbulent is discuss below,

Parameters	Laminar flow	Turbulent flow
Reynolds number	Less than 2000	Greater than 4000
Viscosity	Low	High
Movement of the molecules in the liquid substance	Regular movement is present	Irregular movement is present
Mathematical analysis	Easy to do	Complication is appear
Motion Direction	Layers of the flow of the water is flow in one direction and no mixing of the liquid is occur	Average motion is present and that is not one directional and mixing of the liquid is occur
Occur	Small size diameter rod	Bigger size diameter rod
Shear stress	Shear stress of the flow of laminar is depending on the viscosity of the liquid substance and not depends on the liquid substance density.	Shear stress of the flow of turbulent is depending on the density of the liquid substance.

Examples of laminar flow mainly found in the cases where the flow of the channel is comparatively smaller than the regular flow. In this article examples of laminar flow and its related everything is prate.

The 11+ examples of laminar flow are listed below:-

• Aircraft
• Canals
• River
• Taps
• Tea pouring from kettle
• Viscous fluid
• Fountains
• Smoke
• Water balloon
• Blood flow
• Honey run from the container

What is the meaning of laminar flow?

In the laminar flow the physical quantities remains same for this particular reason the laminar flow also called as the flow of streamline. In the laminar flow pressure, velocity and many more physical quantities remains same.

Laminar flow explain as,  the viscous fluid when flow in a motion that time the molecules of the viscous fluid can move in parallel layers at a certain time period. In the flow of the laminar velocity and pressure and other parameter of physical stays same at the each of the particles of the parallel layers.

When a viscous fluid flow is a motion through a closed system such as rod or pipe and middle of the flat plates that time flow of the laminar is appear. Laminar flow of a viscous fluid depends upon viscosity, velocity and the shape or size of the rod.

In which factors the flow of the laminar is dependent?

If we go through the law of Poiseuille then how the flow of the laminar is dependent on the physical factor easily can be understand.

The flow of laminar depends on some factors. The factors are,

• Viscosity
• Velocity
• Pressure
• Size of the rod or pipe

Viscosity:

The flow of laminar depends on viscosity. The relationship with the flow of laminar and viscosity is indirectly proportional to each other. Means if the rate of viscosity is increases then the value of flow of laminar is decreases and if the rate of viscosity is decreases then the value of flow of laminar is increases.

Velocity:

The flow of laminar depends on velocity. The relationship with the flow of laminar and velocity is directly proportional. Means if the rate of velocity is increases then the value of flow of laminar is also increases and if the rate of velocity is decreases then the value of flow of laminar is also decreases.

Pressure:

The flow of laminar depends on pressure. The relationship with the flow of laminar and pressure is directly proportional to each other. Means if the rate of pressure is increases then the value of flow of laminar is also increases and if the rate of pressure is decreases then the value of flow of laminar is also decrease in the same way.

Size of the rod or pipe:

The flow of laminar depends on size of the rod or pipe. The relationship with the flow of laminar and size of the rod or pipe is indirectly proportional to each other. Means if the rate of size of the rod or pipe is increases then the value of flow of laminar is decreases and if the rate of size of the rod or pipe is decreases then the value of flow of laminar is increases.

The relation between Reynolds number and flow of the fluid:

Reynolds number is dimensionless physical factor. By the using Reynolds number easily can estimate the type of the flow of viscous fluid. The Reynolds number easily can understand us the flow is laminar or turbulent.

The relation between Reynolds number and flow of the fluid is given below,

Where,

R_e = Reynolds number

ρ = Density for the viscous fluid

V = Characteristic velocity for the viscous fluid

L = Characteristic length for the viscous fluid

μ = Dynamic viscosity for the viscous fluid

v = Kinematic viscosity for the viscous fluid

The change of state middle of the dynamic viscosity and kinematic viscosity is given below,

v = μ/ρ

Reynolds number:-

Reynolds number can be deriving as the ratio between the inertia force and viscous force.

Mathematically Reynolds number can be written as,

R_e = ρuL/μ

Where,

R_e = Reynolds number

ρ = Density of the viscous fluid

u = Speed of flow of the viscous fluid

L = Characteristics linear dimension of the viscous fluid

μ = Dynamic viscosity of the viscous fluid

With the help of Reynolds number we can estimate several properties of the fluid such as viscosity, velocity, length, pressure and many others.

The 11+ examples of laminar flow derive briefly in below;

Aircrafts:

An aircraft is a machine or vehicle that can fly with the support of air. An aircraft can fly using the force of static lift, force of dynamic lift with the air foil. An aircraft is an example of laminar flow which we use in our practical daily life. By the help of aircraft anybody can reach to their desired place in a very short time.

Canals:

A canal is an example of laminar flow which we use in our practical daily life. Canal actually a waterway which made of artificially for transfer vehicles in the waterway or to build the management of the drainage system. Canal can carry free, in a smooth calm surface where water easily can flow under the pressure of atmospheric.

River:

A river is an example of laminar flow which we use in our practical daily life. A river is actually a natural waterway that depth can be huge or shallow. In the river the water is falls towards the downstream due to the gravitational force. A smaller size river that also known as brook, stream or creek.

Taps:

A tap is an example of laminar flow which we use in our practical daily life. When the water is comes through the tap the flow will straight there turbulence is not present. When the water is comes from taps that moment pressure and viscosity became same at each point of the water.

Read more about Pipe Elbow Dimensions : Exhaustive Problems Solution and Facts

Tea pouring from kettle:

Tea pouring from kettle is an example of laminar flow which we are used in our practical daily life. When tea is comes through the nozzle of the kettle the flow will straight and there turbulence is not present for this reason laminar flow is appearing. When the tea is comes from kettle that moment pressure and viscosity and other parameter of physical remain same at each point of the tea.

Viscous fluid:

Every viscous fluid is an example of laminar flow which we use in our practical daily life. In every viscous fluid pressure, viscosity and other parameter of physical remain same at each point of the fluid for this reason laminar flow is appearing.

Read more about Volumetric flow rate : It’s All important Concept

Fountains:

A fountain is an example of laminar flow which we use in our practical daily life. A fountain is actually a reservoir which is used as decoration. In the decorative reservoir mainly water is discharge. In every fountain the pressure, viscosity and other parameter of physical remain same at each point of the water for this reason laminar flow is appearing.

Read more about Mass flow rate : Its Important relations and FAQs

Smoke:

A smoke is an example of laminar flow which we produce in our practical daily life. When smoke is comes there turbulence is not present for this reason laminar flow is appearing. In smoke pressure and viscosity and other parameter of physical remain same at each point.

Water balloon:

A water balloon is an example of laminar flow which we use in our practical daily life. When water is comes through the balloon the flow of the fluid will straight and there turbulence is not present for this reason laminar flow is appearing.

Blood flow:

Blood flow an example of laminar flow which we use in our practical daily life. When blood is flow that time layer will be one directional.

Honey run from the container:

Honey run from the container an example of laminar flow and that time turbulence is absent and viscosity ans velocity stays same in each and every point of the honey.

This article answers the question why does ionization energy increase across a period? We will study basics of periodic table first.

Then carry our discussion to trends followed by ionisation energy of different elements in the periodic table. It is important to know the meaning of ionisation energy first, so we shall discuss about ionisation energy and then continue with our discussion.

What is ionisation energy?

If we want to remove an electron from an atom, it is logical to remove the most loosely packed electron of that atom.

Ionisation energy is the name given to this energy that is required to remove the loosely packed electron. Without this energy, we won’t be able to remove the electron from the influence of nuclear force of attraction.

Image credits: Double sharp, First Ionization Energy blocks, CC BY-SA 4.0

What is periodic table?

Periodic table is a table which represents different chemical elements found on Earth. These elements are given a specific atomic number and are then arranged in ascending order of atomic number.

Periodic table has many divisions in it. These divisions are called as blocks. With all the rows being called as period and all the columns being called as groups. We shall study about the trends of ionisation energy across both periods and groups.

What is atomic number?

Atomic number is considered as the fingerprint of the chemical element. It is simply the total number of protons present inside the atom.

Number of protons for every chemical element is unique hence it is considered as the fingerprint of that particular chemical element. The arrangement of chemical elements in the periodic table is done in increasing values of atomic numbers.

What is a period?

A period is simply a row in periodic table. Horizontal arrangement of chemical elements in periodic table is termed as period.

The atomic number increases by 1 as we move ahead in a period. The last element of any period is a noble gas. Noble gases have no free electron revolving around the nucleus. Noble gases are considered as the most stable elements in the periodic table.

What is a group?

As discussed above, rows of periodic table are called as period. Similarly, the columns are called as groups.

Here as we move down the group, the atomic number increases but not by 1. These groups divide metals from non metals and noble gases and alkali metals. Even the groups follow a trend for different properties. We shall discuss about them in later sections of this article.

Periodic trends

Different properties follow different trends as we move from left to right in a period. There are certain exceptions as well which don’t fit inside the trend.

We shall discuss about different trends in a period in the section given below-

• Atomic radius– The atomic radius or the size of an atom generally decreases as we move across a period from left to right. This is due to the fact that the magnitude of nuclear charge is same but number of electrons keep increasing in the shell.
• Ionsiation energy- Ionisation energy depends on the atomic radius. As the radius decreases acrosss a period, the ionisation energy keeps on increasing as we move across a period. It is maximum for nobel gases.
• Electorn affinity– This property is exactly opposite to ionisation energy. Energy is released when an electron is stuffed into an atom meaning it is added to an atom. Electron affinity will increase while moving towards right in the periodic table.
• Electronegativity – This property increases its value when we move towards right in the period. Metallicity- The metals are situated at the left hand side of the periodic table and non metals are situated at the right hand side of the periodic table. We can conclude that the metallicity value decreases when we move towards right in a period.

Group trends

A column of periodic table is called as group. The properties exhibited by these elements follow different trends along the group. We shall discuss about these trends in section given below-

• Atomic radius- As we move down the group, an extra shell is added in the elements. We can say that due to addition of an extra shell, the atomic radius increases as we go down along the group.
• Ionisation energy – The minimum value of energy required to pull out an electron from the influence of nucleus is called as ionisation energy. As the atomic radius increases as we move down the group, the influence of nucleus decreases on the electron and hence it becomes easier to remove electron. So we can conclude that the value of ionisation energy decreases as we go down along the group.
• Electron affinity– Its meaning is right opposite to that of ionisation energy. Atom will release energy if an electron is plucked from it or stuffed into it. Similar to the trend of ionisation energy, electron affinity decreases while moving towards bottom in a group.
• Electronegativity– While going towards the bottom of group, electronegativity keeps decreasing.
• Metallicity- Metallicity can becompared to the tendency of an atom to lose electron. Metallicity increases while going towards the bottom of group in periodic table.

Why does ionization energy increase across a period?

Coming to the most important question in this article that is why does ionization energy increase across a period? The answer is already discussed n above sections, but we shall discuss it again.

Atomic radius is a deciding factor behind the energy required to remove the loosely packed electron. This is because smaller the radius, closer the electron will be to the nucleus. Hence greater will be the attractive force of nucleus towards electron. Hence ionisation energies of Hydrogen is low and keeps on increasing as we move towards right in the period. Only Oxygen has an exception because it forms electron pairs, due to repulsive forces, the electron is easily removed.

Why is second ionisation energy greater than first ionisation energy?

The name itself suggests that first ionisation energy is related to the first electron. It is the energy required to pluck out the first electron from the atom.

Similarly the second ionisation energy is used to remove second electron from the already electron deficit atom. The influence of nucleus on electron increases as and when we dig deeper into the atom. Hence it becomes difficult to remove that electron from the influence of nucleus thus justifying the fact that second ionisation energy is more than first ionisation energy.