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mat_cfd September 3, 2013 07:55

Mass flow rate of phase in post
I am simulating evaporation of R134a in tube using Thermal phase change model in CFX. Liquid is continuous while vapour as dispersed fluid with heat flux at wall.
I am using expression---areaAve(R134aRKv.Mass Flow)@Refg out out which is giving me 0 kg/s while Vol fraction is showing all liquid converting to vapour at outlet. All options to find average value of mass flow of particular phase in Post is giving 0 kg/s while the total mass flow at outlet using exprsn----massFlow()@Refg out is giving me the value. Also if I monitor it in solver under flow parameter at outlet it is giving me seperate phase mass flow rate which is totaling to total mass flow rate of post but it is showing more liquid flow than vapour. However post is showing Vol fraction of vapour as 0.985 at outlet . Cant understand how the individual mass flow rate of solver is not matching with Vol fraction of post. Anybody can understand this difference in solver and post result and also knows how to find mass flow of particular phase in post.

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