Hi all,

Can water be heated by 4 degC when undergoes throttling process in valve from pressure 125 bar and 50 degC to 4 bar?

The result is from process simulation with Soave-Redlich-Kwong (SRK) EOS.

Is the process of water throttling similar to gas throttling (Kelvin-Thompson effect, inversion temperature)?

Could the SRK model be applied for water. What is appropriate EOS for some kind of real water (something like real gas)?

thanks.

In my ph.d study, I used the Tait EOS, stiffend gas law to model the water. Not sure wether those EOS provide the ability to include such pressure-dependent features.

Tait's equation is the most commonly used EOS for water. However, this equation is for a isothermal process. In my understanding there are several EOS's available in the literature for water.

One another EOS for water is:

p+pc=rho*K*(T+Tc)

where pc=1944.61MPa, K=472.27 and Tc=3837K. This EOS accounts for changes in temperature also.

Fore more details:

Shin et al, "Numerical simulation of unsteady cavitating flows using a homogenous equilibrium model", Computational Mechanics, 30:388-395,2003.