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.

Is a polytropic process adiabatic?

PVn = constant Where P is the pressure, V is the volume and n is a constant. Hence, to hold PV constant in the polytropic gas expansion/compression process, both heat and work interchange takes place between the system and surrounding. Therefore, polytropic is a non-adiabatic process.

Are all 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.

Which process is defined if’n 1 in a polytropic process?

the case n = 1, pV = constant, corresponds to an isothermal (constant-temperature) process. the case n = , pV = constant, corresponds to an isentropic (constant-entropy) process. the case n ➝ ∞ corresponds to an isochoric (constant-volume) process.

What is the definition of a polytropic process?

A polytropic process is any thermodynamic process that can be expressed by the following equation: pVn = constant. Definition and characteristics of Polytropic Process. Thermal Engineering The polytropic process can describe gas expansion and compression which include heat transfer.

How is boundary work done in the polytropic process?

The Polytropic Process: The specific heats will be discussed later. The boundary work done during the polytropic process is found by substituting the pressure volume relation into the boundary work equation. The result is For an ideal gas under going a polytropic process the boundary work is.

How is the polytropic process of an ideal gas described?

Polytropic Process of an Ideal Gas Polytropic Process of an Ideal Gas •The relationship between the pressure and volume during compression or expansion of an ideal gas can be described analytically. One form of this relationship is given by the equation pVn = constant •where n is a constant for the particular process.

How is the polytropic index used in thermal engineering?

Thermal Engineering 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. the case n = 0, p= constant, corresponds to an isobaric (constant-pressure) process.