VOF Steam condensation

Andrea159357 · January 22, 2019, 06:47

Hello, i'm trying to analyze a condensation process in a pipe line using VOF mixture model but i got some problem understand how it works. I set Fluent as this tutorial said, https://www.youtube.com/watch?v=rRsdQC20NvA, exept for operationg pressure that is P = 8 [bar] and saturation temperature Ts = 443.15 [K].

T inlet = 473.15 [K] where water vapor density is 3.8314 (heated steam). When i set material, i defined water liquid and water vapor but at what condition? I mean, water liquid is not really a problem; i defined all coefficients at saturation temperature and pressure.
Different story is for water vapor; do i must defeine density at saturation or in heated condition?

CFD-fellow · January 30, 2019, 07:02

I think defining density as a linear function of temperature is a good idea.

jibinyg · March 8, 2019, 09:17

Quote:

Originally Posted by Andrea159357

Hello, i'm trying to analyze a condensation process in a pipe line using VOF mixture model but i got some problem understand how it works. I set Fluent as this tutorial said, https://www.youtube.com/watch?v=rRsdQC20NvA, exept for operationg pressure that is P = 8 [bar] and saturation temperature Ts = 443.15 [K].

T inlet = 473.15 [K] where water vapor density is 3.8314 (heated steam). When i set material, i defined water liquid and water vapor but at what condition? I mean, water liquid is not really a problem; i defined all coefficients at saturation temperature and pressure.
Different story is for water vapor; do i must defeine density at saturation or in heated condition?

Hi,
I am also dealing with the same problem of steam condensation in water with vof multiphase model. But now as the iteration progresses, the steam keep growing in upward direction(-g) opposite to the direction of water.
Have you used any udf for condensation model?
Any help to this problem will be great thing.
Thanks in advance.

Andrea159357 · March 19, 2019, 15:19

No, i didn't use UDF for condensation but you can use it. I ran the model with fluent condensation model just for a qualitative test. if you need really accurate results it's better you write your own udf

Andrea159357 · March 19, 2019, 15:20

For vapor model i think i should have use equation of state.

January 22, 2019, 06:47	VOF Steam condensation	#1
Andrea159357 Member Andrea Join Date: Mar 2018 Posts: 62 Rep Power: 9	Hello, i'm trying to analyze a condensation process in a pipe line using VOF mixture model but i got some problem understand how it works. I set Fluent as this tutorial said, https://www.youtube.com/watch?v=rRsdQC20NvA, exept for operationg pressure that is P = 8 [bar] and saturation temperature Ts = 443.15 [K]. T inlet = 473.15 [K] where water vapor density is 3.8314 (heated steam). When i set material, i defined water liquid and water vapor but at what condition? I mean, water liquid is not really a problem; i defined all coefficients at saturation temperature and pressure. Different story is for water vapor; do i must defeine density at saturation or in heated condition?

January 30, 2019, 07:02		#2
CFD-fellow Senior Member Behrooz Jamshidi Join Date: Apr 2013 Posts: 110 Rep Power: 14	I think defining density as a linear function of temperature is a good idea. Andrea159357 likes this.

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March 19, 2019, 15:19		#4
Andrea159357 Member Andrea Join Date: Mar 2018 Posts: 62 Rep Power: 9	No, i didn't use UDF for condensation but you can use it. I ran the model with fluent condensation model just for a qualitative test. if you need really accurate results it's better you write your own udf

March 19, 2019, 15:20		#5
Andrea159357 Member Andrea Join Date: Mar 2018 Posts: 62 Rep Power: 9	For vapor model i think i should have use equation of state.