Condensation and Evaporation modelling in Single Heat Exchanger

Somnath rangrej · July 14, 2015, 06:24

I am doing project on "Simulation and Analysis of multiple (3) effect evaporators (2 phase) in Process Industry", in which I want to model two phase flow in Evaporator.
Evaporator is of shell and Tube type, in which hot steam is flowing through the shell and cold water is flowing through the Tubes.
So in the single Heat Exchanger device, Shell side condensation and Tube side evaporation have to be modeled.
How it can be done?
Which model will give good results?
Any tutorial/lecture/theory which will help me to model?

Thanks.

CFDYourself · August 14, 2015, 06:53

Hi Sonnath,
Ansys have some tutorials on heat exchange and two phase flow, so I reccomed contacting ansys support or the ansys customer portal as a first port-of-call.
There are really two parts to your question, and us here can't really tell you the best way to build your model.
one is how do you model heat exchange,
the other is how do you model phase changes in fluent.

off the top of my head, two things that might be useful to you are:
- Fluent's Macro Heat Exchanger model,
- Fluent's Evaporation-Condensation model.

but it's highly application specific, and its possible that a completely different approach would be useful in your model (eg: you might want to set a T-profile using UDFs. if you're interested in mass-transfer, or falling films, the evaporation-condensation model might be useless, etc. etc. etc.).

July 14, 2015, 06:24	Condensation and Evaporation modelling in Single Heat Exchanger	#1
Somnath rangrej New Member somnath Join Date: Jul 2015 Posts: 7 Rep Power: 11	I am doing project on "Simulation and Analysis of multiple (3) effect evaporators (2 phase) in Process Industry", in which I want to model two phase flow in Evaporator. Evaporator is of shell and Tube type, in which hot steam is flowing through the shell and cold water is flowing through the Tubes. So in the single Heat Exchanger device, Shell side condensation and Tube side evaporation have to be modeled. How it can be done? Which model will give good results? Any tutorial/lecture/theory which will help me to model? Thanks.

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August 14, 2015, 06:53		#2
CFDYourself Member Jim Join Date: May 2015 Posts: 47 Rep Power: 11	Hi Sonnath, Ansys have some tutorials on heat exchange and two phase flow, so I reccomed contacting ansys support or the ansys customer portal as a first port-of-call. There are really two parts to your question, and us here can't really tell you the best way to build your model. one is how do you model heat exchange, the other is how do you model phase changes in fluent. off the top of my head, two things that might be useful to you are: - Fluent's Macro Heat Exchanger model, - Fluent's Evaporation-Condensation model. but it's highly application specific, and its possible that a completely different approach would be useful in your model (eg: you might want to set a T-profile using UDFs. if you're interested in mass-transfer, or falling films, the evaporation-condensation model might be useless, etc. etc. etc.).