# Finding Volume fraction at outlet when it changes its phase.

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 December 20, 2009, 22:56 Finding Volume fraction at outlet when it changes its phase. #1 New Member   Praveen Kumar Jagarlapudi Join Date: Sep 2009 Posts: 7 Rep Power: 7 Hello everyone, I have a refrigerant coming from inlet and passing through some coils. On top of the coils i have a heat source added to the refrigerant. There the refrigerant is changing its phase from liquid to vapour state. I want to use Multiphase model in fluent for this. My primary phase is liquid and secondary phase is Vapour. I have to find out what is the volume fraction of Vapour (phase2) coming from outlet. While defining the problem in fluent (mixture model) is asking for Volume fractions of phase 2 both at inlet and outlet. Suggest me which model i have to use to find out Volume fraction at outlet. I have inlet pressure and flowrate. Thanks in advance. rgd likes this.

August 18, 2014, 07:18
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Join Date: Dec 2012
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Quote:
 Originally Posted by praveen.jpk Hello everyone, I have a refrigerant coming from inlet and passing through some coils. On top of the coils i have a heat source added to the refrigerant. There the refrigerant is changing its phase from liquid to vapour state. I want to use Multiphase model in fluent for this. My primary phase is liquid and secondary phase is Vapour. I have to find out what is the volume fraction of Vapour (phase2) coming from outlet. While defining the problem in fluent (mixture model) is asking for Volume fractions of phase 2 both at inlet and outlet. Suggest me which model i have to use to find out Volume fraction at outlet. I have inlet pressure and flowrate. Thanks in advance.
Hi Praveen,

Have u found the answer to ur question?

I am modelling a similar case, but with no heat exchange & I have velocity at inlet & operating pressure, but no mass flow rate, I'm using VOF & velocity inlet & pressure outlets, to find the mass flow rate at the outlets, but I can't find the volume fraction of the secondary phase at the outlets.
Any thoughts on that?