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

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

Answer 1

[Yifeng Tang]

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.