Evaporation model in Fluent

piopio · December 11, 2013, 04:22

Hi friends,
I'm doing a project, modeling evaporation refrigerant inside a pipe exchanger.
I have some probleme.
Does anyone know what is the Standard State Enthalpy in material properties?
I compare Stadard state enthalpy for water liquid from fluent database with properties from books and tables, and there are different. They should be similar.

Thanks in advance
Peter

Zaktatir · December 11, 2013, 13:01

Standard state enthalpy is the enthalpy formation of your fluid. For evaporation which occurs at constant temperature you need the enthalpy of vapor and of the liquid. The difference is the latent enthalpy which differs from the sensible one.

In Fluent we use the enthalpy in the entity J/kgmolK. With the molar mass you can find the most known one in KJ/KgK.

December 11, 2013, 04:22	Evaporation model in Fluent	#1
piopio New Member Piotr Join Date: Nov 2012 Location: Cracow Posts: 2 Rep Power: 0	Hi friends, I'm doing a project, modeling evaporation refrigerant inside a pipe exchanger. I have some probleme. Does anyone know what is the Standard State Enthalpy in material properties? I compare Stadard state enthalpy for water liquid from fluent database with properties from books and tables, and there are different. They should be similar. Thanks in advance Peter

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December 11, 2013, 13:01		#2
Zaktatir Senior Member Join Date: Jan 2010 Location: Germany Posts: 268 Rep Power: 17	Standard state enthalpy is the enthalpy formation of your fluid. For evaporation which occurs at constant temperature you need the enthalpy of vapor and of the liquid. The difference is the latent enthalpy which differs from the sensible one. In Fluent we use the enthalpy in the entity J/kgmolK. With the molar mass you can find the most known one in KJ/KgK.