how can i get the specific heat at constant volume for two phase fluid Water/Steam

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Mario Augl-Buchberger
回答： Yifeng Tang 2022-7-22
Hallo,
I need the specific heat at constant volume and constant pressure vor the relation cp/cv.
This Link describes how we can get the specific heat at constant pressure, but how do we get the specifict heat capacity at constant volume?
best regards Mario

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回答（1 个）

Yifeng Tang
Yifeng Tang 2022-7-22
Hi Mario,
You should be able to calculate Cv from Cp, temperature, thermal expansion coeffcient, density, and bulk modulus. All available from the fluids property tables. See Wikipedia page on specific heat:
https://en.wikipedia.org/wiki/Specific_heat_capacity#Relation_between_specific_heat_capacities
I believe the beta_T here is the inverse of the bulk modulus.
Hope this helps.

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