condensation
hi everybody
i have to solve a project about ventilation by fluent . in this problem i have a 3D room equippted with chilled ceiling pannels at dew point temperature of humid air in the room. so condensation occurs and liquid water will constituted at the pannels. http://dc208.2shared.com/img/1142452.../test_room.jpg and this is my requests:
thx alot! |
modeling condensation
model condensation as a mass transfer phenomena (eulerian 2 fluid or mixture approach). Activate source terms in wall and use appropriate UDF to generate source / sink terms. Couple it with volume fraction eqn and you will see mass transfer along the walls (formation of droplets etc) which ever you want to see. Total mass along the walls can be easily extracted and added up to find the liquid generated.
my 2c /CFDtoy Quote:
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hi cfdtoy , thank you for your guidance. let me examine and report that.
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hi, i have 1 question:
can i use the "species transport model" to modelling the humid air(water vapor as a species in air) in this problem ? if YES, then can i use udf to make a species-sink in my wall? Thank you for your attention |
amirreza: have you made any progress regarding you condensation problem?
Have you created a UDF ? //Mike |
Hi,
yes, I could calculate the condensation through the cfd programming. I used the correlation of gas diffusion mass transfer in order to calculation the condensation by saturation boundary condition. if you are interested u can find this correlation in the book of "Mass Transfer Operation" by "Robert Treybal." I will be glad to answer more questions. Amirreza |
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(we model a laminar flow problem) #1 Did you use the species transport model, in that case what settings? #2 How can i put relative humidity bc at an inlet or domain? #3 did you write your own udf for the mass transfer of condensate at the boundary, in that case how does it look like? /Mike |
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I have been following this thread. I am also interested if it's possible to model water condensation/evaporation with Mixture model and species transport model. Thanks, Li |
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