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Old   August 27, 2019, 13:16
Default Ansys CFX condensing flows
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Mahesh Chamarti
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I am trying to model a condensing flow in Ansys CFX for a Radial inflow turbine with inlet guide vane and impeller. The expansion causes a 15% by wt liquid at the outlet. Iam having convergence issues by modelling the gas as a fictitious ideal gas by specifying CP,viscosity, molecular weight, conductivity and ref pressure and temperature.
The gas parameters are as follows
cpfld 11721.66 lbf*ft/slug*R
cvfld 8914.53 lbf*ft/slug*R
visc 2.735E-07 lbf*s/ft^2
conduct 5.355E-03 lbf/s*R
tinlet 436.98 R
pinlet 158414.40 psf
pstatic 86027.01 psf
mdot per vane 0.48317 slug/s

Can someone suggest the best way to model this gas ? Thank you.

Regards,
Mahesh
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Old   August 28, 2019, 03:20
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Gert-Jan
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Look for IAPWS or H2ORKvl materials
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Old   August 28, 2019, 11:54
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Mahesh Chamarti
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Hi Gert-Jan,
Thank you for your reply. Can you be more specific? The gas contains methane 94% and 6% ethane by wt. Thank you.
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Old   August 28, 2019, 12:22
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Sorry. I was preoccupied and thought you were talking about Steam.
In your case..........

The Ethane and part of the methane condensates? You should look for:
Materials -> Import Library Data -> import Wet Soave Relich Kwong
Then select CH4vl and C2H6vl

If you select these materials, you will model the gas and liquid as equilibrium. Then the interphase mass transfer is instantaneous. If you want to model non-equilibrium materials, you need to select the v and l materials separate and setup the mass transfer rates yourself, using Ranz Marshall or similar.

Good luck. You might need this.
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