CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

Ansys CFX condensing flows

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 27, 2019, 12:16
Default Ansys CFX condensing flows
  #1
New Member
 
Mahesh Chamarti
Join Date: Feb 2017
Posts: 17
Rep Power: 9
maheshchamarti is on a distinguished road
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
maheshchamarti is offline   Reply With Quote

Old   August 28, 2019, 02:20
Default
  #2
Senior Member
 
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,835
Rep Power: 27
Gert-Jan will become famous soon enough
Look for IAPWS or H2ORKvl materials
Gert-Jan is offline   Reply With Quote

Old   August 28, 2019, 10:54
Default
  #3
New Member
 
Mahesh Chamarti
Join Date: Feb 2017
Posts: 17
Rep Power: 9
maheshchamarti is on a distinguished road
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.
maheshchamarti is offline   Reply With Quote

Old   August 28, 2019, 11:22
Default
  #4
Senior Member
 
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,835
Rep Power: 27
Gert-Jan will become famous soon enough
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.
Gert-Jan is offline   Reply With Quote

Reply

Tags
ansys, cfx, gas model

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ansys SIG$ILL error loth ANSYS 3 December 24, 2015 05:31
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
Orthotropic Properties in ANSYS CFX 14.5 (XY, YZ, XZ) lmark84l CFX 2 August 6, 2014 11:34
ANSYS CFX Tutorial Rashid CFX 25 December 20, 2012 01:22
CFX bought by Ansys - good or bad?! Pete CFX 38 February 21, 2003 07:34


All times are GMT -4. The time now is 12:45.