Condensation Mass Flow Rate

Aseel · April 23, 2019, 14:53

Hello everyone,

I have created a model to estimate the condensation mass flow rate. I used VOF, Energy and K epsilon Models. My model has a velocity inlet for the steam to enter and a pressure outlet. the solution converges. But, the issue is that the mass flow rate for the water liquid is zero! I increased the number of iterations. But, there is no change. I only get the mass flow rate for the mixture or the water vapor.

Please, find the picture of the obtained results.

Does anyone have any idea? or encountered a similar issue.

Thanks in advance.

mmntmflx · April 25, 2019, 13:30

which mass transfer model did you use? Can you define your setup more detailed?

Aseel · April 28, 2019, 04:08

I have used the evaporation-condensation mass transfer model specifically Lee model (I think its the default one).

by the way, it's a 2D CFD model, the initial conditions are at room temperature. the entering steam is at 380 K (above saturation temp). the temperature of the walls is maintained below the Tsat to allow the condensation.

the velocity inlet is about 0.11 m/s .
the backflow total temperature at the outlet is 300 K..

Thank you!

April 25, 2019, 13:30	Condensation Mass Flow Rate	#2
mmntmflx Member Melih Meriç Join Date: Apr 2011 Posts: 46 Rep Power: 15	which mass transfer model did you use? Can you define your setup more detailed? Last edited by mmntmflx; April 26, 2019 at 02:25.

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April 28, 2019, 04:08		#3
Aseel New Member Aseel Join Date: Apr 2019 Posts: 2 Rep Power: 0	I have used the evaporation-condensation mass transfer model specifically Lee model (I think its the default one). by the way, it's a 2D CFD model, the initial conditions are at room temperature. the entering steam is at 380 K (above saturation temp). the temperature of the walls is maintained below the Tsat to allow the condensation. the velocity inlet is about 0.11 m/s . the backflow total temperature at the outlet is 300 K.. Thank you!