Polytropic processes

  • #1
polytropic processes are characterized by pvn = constant.

are they valid for both reversible as well as irreversible processes?
 

Answers and Replies

  • #2
Andrew Mason
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polytropic processes are characterized by pvn = constant.

are they valid for both reversible as well as irreversible processes?
It depends.

The relationship PV= constant (ie n = 1) for an ideal gas applies for all isothermal processes, reversible or non-reversible (ie. PV=nRT)

However, the adiabatic condition for an ideal gas:

[itex]PV^\gamma = K[/itex] applies only to a reversible adiabatic change.

AM
 
  • #3
thanks Andrew.

suppose if there is a process in which heat flow is happening and the temperature of the system is not constant, lets assume that polytropic index is in the range 1 < n < γ.

if the process was reversible, then it is reversible polytropic process and we can characterize it by pvn = constant.

but what if there was friction or some other sort of irreversibility?
how do we take that into account? how can we characterize such polytropic processes?
 

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