condensate film on a wall

altano · April 25, 2012, 15:12

Hello,
I'm trying to simulate defogging on simple cabinet model like windshield aplication.
In CFX, is it possible to define a certain thickness of uniformly distributed water condensate film on a wall as an initial condition? I would like to see the effect of defroster nozzle geometry on condansate film evaporation.

Continuous phase: gas mixture (air ideal gas and h2o<vapor>)
Version: 12.1

thanks

ghorrocks · April 25, 2012, 20:29

You might be able to adapt the wall film model (developed for IC engine fuel applications) to this. Otherwise you might be able to use an additional variable. Both of these options are tricky and will require development.

altano · April 26, 2012, 02:30

Thank you Glenn,

So, I should try to particle spray over wall to form a film at first, am I wrong?

ghorrocks · April 26, 2012, 07:13

I have never used this model so cannot tell you how to use it. Hopefully you can set an initial condition but I am not sure.

altano · April 26, 2012, 09:01

Thank you very much Glenn,

April 25, 2012, 15:12	condensate film on a wall	#1
altano New Member Join Date: Jun 2010 Posts: 21 Rep Power: 16	Hello, I'm trying to simulate defogging on simple cabinet model like windshield aplication. In CFX, is it possible to define a certain thickness of uniformly distributed water condensate film on a wall as an initial condition? I would like to see the effect of defroster nozzle geometry on condansate film evaporation. Continuous phase: gas mixture (air ideal gas and h2o<vapor>) Version: 12.1 thanks

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Natural convection in a closed domain STILL NEEDING help!	Yr0gErG	FLUENT	4	December 2, 2019 01:04
Very technical question about solving wall boundary layer ...	jlb001	FLUENT	6	December 27, 2014 06:56
UDF for wall slipping	HFLUENT	Fluent UDF and Scheme Programming	0	April 27, 2011 13:03
Wall functions?	Pr	Main CFD Forum	7	April 8, 2004 07:15
Quick Question - Wall Function	D.Tandra	Main CFD Forum	2	March 16, 2004 05:29

April 25, 2012, 20:29		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	You might be able to adapt the wall film model (developed for IC engine fuel applications) to this. Otherwise you might be able to use an additional variable. Both of these options are tricky and will require development.

April 26, 2012, 02:30		#3
altano New Member Join Date: Jun 2010 Posts: 21 Rep Power: 16	Thank you Glenn, So, I should try to particle spray over wall to form a film at first, am I wrong?

April 26, 2012, 07:13		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	I have never used this model so cannot tell you how to use it. Hopefully you can set an initial condition but I am not sure.

April 26, 2012, 09:01		#5
altano New Member Join Date: Jun 2010 Posts: 21 Rep Power: 16	Thank you very much Glenn,