When to use polytropic process?

Asked by: Caitlin Adams  |  Last update: 18 June 2021
Score: 4.7/5 (71 votes)

The term "polytropic" was originally coined to describe any reversible process on any open or closed system of gas or vapor which involves both heat and work transfer, such that a specified combination of properties were maintained constant throughout the process.

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Simply so, What is a polytropic process used for?

The polytropic process can describe gas expansion and compression which include heat transfer. The exponent n is known as the polytropic index and it may take on any value from 0 to ∞, depending on the particular process.

Keeping this in mind, How do you know if a process is Polytropic?. a polytropic process is a reversible process involving a gas or vapor in a closed or open system involving both heat and work transfer such that a combination of properties are maintained constant. It follows the equation PV^n= C where P is pressure, V is Volume and n the polytropic index and C is a constant.

Similarly one may ask, What is the difference between adiabatic and polytropic process?

The key difference between adiabatic and polytropic processes is that in adiabatic processes no heat transfer occurs whereas in polytropic processes heat transfer occurs. In chemistry, we divide the universe into two parts.

What is the boundary work equation for Polytropic process?

For an ideal gas, P1 V1 is just nRT1 and P2 V2 is nRT2. The result is that the boundary work is n times R times the change in temperature divided by the quantity 1 minus δ.

39 related questions found

What is meant by Polytropic process?

The term "polytropic" was originally coined to describe any reversible process on any open or closed system of gas or vapor which involves both heat and work transfer, such that a specified combination of properties were maintained constant throughout the process.

In which process work done is zero?

An isochoric process is one in which the volume is held constant (V=constant), meaning that the work done by the system will be zero.

What is difference between isentropic and polytropic process?

In simple words, Isentropic process is one in which the entropy remains constant throughout. Polytropic process is one which obeys the law given below throughout the process.

What does N mean in a polytropic process?

A polytropic process is one where the pressure and volume of a system are related by the equation PVn= C. Where P represents the pressure, V represents the volume, n represents the polytropic index, and C is a constant.

Which of the following is true for Polytropic process?

7. Which of the following is true for a polytropic process? Explanation: These are the properties of an adiabatic process. Explanation: It comes from the p1*(v1^n) = p2*(v2^n).

Are polytropic processes reversible?

Polytropic processes are internally reversible. Some examples are vapors and perfect gases in many non-flow processes, such as: n=0, results in P=constant i.e. isobaric process.

What happens in throttling process?

Throttling is a process where a high-pressure fluid is converted into low-pressure by using a throttle valve. In a throttling process, the enthalpy remains constant and the work done is zero.

What is hyperbolic process?

Hyperbolic Process- it is the process where the gas is heated or expanded in such a way that the product of its pressure and volume remains constant. ... Isothermal Process- it is the process in which the temperature of the working substance remains constant during expansion or compression.

Is work done in an isobaric process?

Isobaric Process (Constant Pressure)

An isobaric process occurs at constant pressure. Since the pressure is constant, the force exerted is constant and the work done is given as PΔV. ... Since pressure is constant, the work done is PΔV.

What is adiabatic process example?

An example of an adiabatic process is the vertical flow of air in the atmosphere; air expands and cools as it rises, and contracts and grows warmer as it descends. Another example is when an interstellar gas cloud expands or contracts. Adiabatic changes are usually accompanied by changes in temperature.

What is Polytropic efficiency?

Polytropic efficiency is another concept of efficiency often used in compressor evaluation. It is often referred as small stage or infinitesimal stage efficiency. It is the true aerodynamic efficiency exclusive of the pressure-ratio effect.

What is meant by adiabatic process?

An adiabatic process is defined as a process in which no heat transfer takes place. This does not mean that the temperature is constant, but rather that no heat is transferred into or out from the system.