Evaporation and condensation in a tube

February 23, 2009, 16:26

I am new in Fluent. Can anyone tell me if Fluent can simulate evaporation and condensation of water in a pipe? I would appreciate it if anyone can help me! Thanks a lot!

ktsai2003 · July 23, 2009, 11:51

Fluent 12 do have a simple evaporation/condensation model available. However, it is not thermodynamically consistent. The model does not detect vapor go below staturation temperautre and vice versa. So you can get really cold vapor and really hot liquid way beyond the stauration temperautre as specified. A better choice is to use the WET-STEAM model which uses a saturation curve for phase change and should be physically consistent.

memahfud · September 15, 2009, 22:45

but range temperature for wet steam is 347 to 647, what about if the case is in law temperature, such as evaporation liquid nitrogen?

Regards,
Irham

ktsai2003 · September 16, 2009, 11:14

Fluent's wet steam model is based on partial pressure but can only be used with density based solver, which can be quite expensive. The evaporation-condensation model is only good for a dilute system. If your case involves lots of other gases with steam, then it is probably ok. For systems with pure steam it won't be able to provde a reasonable answer.

ktsai2003 · September 16, 2009, 11:19

For liquid nitrogen you will need a saturation curve for it. Fluent's wet steam model is only good for water vapor.

February 23, 2009, 16:26	Evaporation and condensation in a tube	#1
Wei Shao Guest Posts: n/a	I am new in Fluent. Can anyone tell me if Fluent can simulate evaporation and condensation of water in a pipe? I would appreciate it if anyone can help me! Thanks a lot!

July 23, 2009, 11:51	Fluent's model too simple to be useful	#2
ktsai2003 New Member Kuochen Tsai Join Date: Apr 2009 Posts: 5 Rep Power: 17	Fluent 12 do have a simple evaporation/condensation model available. However, it is not thermodynamically consistent. The model does not detect vapor go below staturation temperautre and vice versa. So you can get really cold vapor and really hot liquid way beyond the stauration temperautre as specified. A better choice is to use the WET-STEAM model which uses a saturation curve for phase change and should be physically consistent.

September 16, 2009, 11:14	Wet Steam	#4
ktsai2003 New Member Kuochen Tsai Join Date: Apr 2009 Posts: 5 Rep Power: 17	Fluent's wet steam model is based on partial pressure but can only be used with density based solver, which can be quite expensive. The evaporation-condensation model is only good for a dilute system. If your case involves lots of other gases with steam, then it is probably ok. For systems with pure steam it won't be able to provde a reasonable answer.

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September 15, 2009, 22:45		#3
memahfud New Member muhammad irham mahfud Join Date: May 2009 Posts: 14 Rep Power: 17	but range temperature for wet steam is 347 to 647, what about if the case is in law temperature, such as evaporation liquid nitrogen? Regards, Irham

September 16, 2009, 11:19		#5
ktsai2003 New Member Kuochen Tsai Join Date: Apr 2009 Posts: 5 Rep Power: 17	For liquid nitrogen you will need a saturation curve for it. Fluent's wet steam model is only good for water vapor.