change of phase simulation

Amar Kad · March 12, 2016, 07:15

good evening
i want to simulate the change of phase of R12 flow inside frictional adiabatic pipe . the phase change occurs due to two reason the first reason is when heat flux applied to the tube and the second is when the pressure drop due to friction
can any one helps me in this simulation using CFX ?

Amar Kad · March 18, 2016, 06:00

hi
i want to simulate vaporization of R12 due to frictional pressure drop inside a pipe
can you help me
thanks

ghorrocks · March 18, 2016, 19:42

I have no expertise in your exact simulation, but I can say:

* Your model is complex, involving compressible flow, phase change and complex material property models. You should expect that this is going to be a difficult model to get working. It is not for beginners.

* I am not sure the nucleation model in CFX will be suitable for this type of flow - I will leave it up to you to investigate this and confirm or deny.

* You need to build complex models piece by piece. First model a simple compressible gas in your geometry. Do you get the flow accelerating due to friction as we expect for a compressible flow? Then do a simple thermally driven phase change model for water, and when that works try R12. And only once all that is working should you try all the models together.

March 12, 2016, 07:15	change of phase simulation	#1
Amar Kad Member Amar Join Date: Jan 2016 Posts: 39 Rep Power: 10	good evening i want to simulate the change of phase of R12 flow inside frictional adiabatic pipe . the phase change occurs due to two reason the first reason is when heat flux applied to the tube and the second is when the pressure drop due to friction can any one helps me in this simulation using CFX ?

March 18, 2016, 19:42		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I have no expertise in your exact simulation, but I can say: * Your model is complex, involving compressible flow, phase change and complex material property models. You should expect that this is going to be a difficult model to get working. It is not for beginners. * I am not sure the nucleation model in CFX will be suitable for this type of flow - I will leave it up to you to investigate this and confirm or deny. * You need to build complex models piece by piece. First model a simple compressible gas in your geometry. Do you get the flow accelerating due to friction as we expect for a compressible flow? Then do a simple thermally driven phase change model for water, and when that works try R12. And only once all that is working should you try all the models together. Amar Kad likes this.

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March 18, 2016, 06:00		#2
Amar Kad Member Amar Join Date: Jan 2016 Posts: 39 Rep Power: 10	hi i want to simulate vaporization of R12 due to frictional pressure drop inside a pipe can you help me thanks