UDF for latent hear transfer between two phase

dkb_bg · May 21, 2012, 06:48

Dear all
i am trying to model phase change from liquid to vapour .i am getting the phase change but temperature of liquid is not changing, but in actual practice it should decrease since latent heat is released from the liquid. what is the udf for this type of problem/or is there any other method to deal this problem

can anybody help me really i will be very grateful.

thanks

Danial Q · May 21, 2012, 18:26

Phase change occurs at constant temperature and heat will be added to liquid phase (not released) ,am I right? if system goes down to low temperature limits , means some sensible heat loss occured. I dont knw abt udf's but may be you should check your conditions set for system again. I am also dealing with phase change but in cfx not in fluent.
cheers

dkb_bg · May 21, 2012, 23:23

Dear sir thanks for your guidance
my problem is adiabatic no heat source is there, and phase change is only due to drop in pressure below its saturation pressure.

May 21, 2012, 06:48	UDF for latent hear transfer between two phase	#1
dkb_bg New Member deepak Join Date: Sep 2011 Location: india Posts: 8 Rep Power: 14	Dear all i am trying to model phase change from liquid to vapour .i am getting the phase change but temperature of liquid is not changing, but in actual practice it should decrease since latent heat is released from the liquid. what is the udf for this type of problem/or is there any other method to deal this problem can anybody help me really i will be very grateful. thanks

May 21, 2012, 18:26	HI	#2
Danial Q Senior Member Danial Join Date: Nov 2011 Posts: 179 Rep Power: 14	Phase change occurs at constant temperature and heat will be added to liquid phase (not released) ,am I right? if system goes down to low temperature limits , means some sensible heat loss occured. I dont knw abt udf's but may be you should check your conditions set for system again. I am also dealing with phase change but in cfx not in fluent. cheers

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May 21, 2012, 23:23		#3
dkb_bg New Member deepak Join Date: Sep 2011 Location: india Posts: 8 Rep Power: 14	Dear sir thanks for your guidance my problem is adiabatic no heat source is there, and phase change is only due to drop in pressure below its saturation pressure.