# Condensation

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 December 10, 2002, 17:19 Condensation #1 Christian Guest   Posts: n/a Hi, Are there any one how have try to use or implement condensation of mointure in the air from one phase to another(water) in either CFX 4 or CFX 5 ? If so how is this done ? Any examples ? Thanks regards Christian

 December 11, 2002, 09:07 Re: Condensation #2 Holidays Guest   Posts: n/a Hi, It has been done in both codes (not by me!). For CFX-4 check this out with CFX support because I have no details. In CFX-5 you can manage your mass transfer via source and sink terms(The only thing I have so far is for evaporation however) . This should be generalised in the next release and since real gaz, cavitation are appearing in CFX-5 applications it should be even better.

 December 11, 2002, 13:58 Re: Condensation #3 Christian Guest   Posts: n/a Hi Simple question. Would you be willing to share your implmentation of sources and sinks for evaporation ? Thanks in advance Regards Christian

 December 12, 2002, 06:46 Re: Condensation #4 Holidays Guest   Posts: n/a Evaporation Water to "Air" for example: Set up an expression for the evaporation rate revap in kg m^-3 s^-1 en fonction de la temperature de l'eau par exemple Water at RTP.T which becomes a sink for the air and a source for the water. For exemple write a function based upon the temperature exponential around 373K to create a step function switching from 0 to 1 around that temperature smootly. Then you must also withdraw the latent energy from the water with a sink in the form of: 2.28 [J kg^-1]*revap. Something along these lines should work well with CFX-5.5.1 solver. Look on the web for more details about such thermodynamics.

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