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

Heat Flux at boundary inconsistency

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 7, 2020, 02:00
Default Heat Flux at boundary inconsistency
  #1
Member
 
Ashish Magar
Join Date: Jul 2016
Location: Mumbai, India
Posts: 65
Rep Power: 5
ashishmagar600 is on a distinguished road
Hello Everyone..!

I am trying to simulate a shell and tube heat exchanger (STHX) case, wherein I solve for flow and heat using chtMultiRegionSimpleFoam.

I obtained heat flux through each tube wall as around 50000 W/m2.

However, when I tried a case with a single tube with walls and giving 50000 W/m2 as out-flux (meaning negative flux) at the outer solid walls of the tube, I am getting temperatures below 273K. The simulation with the complete geometry of SHTX did run properly and had reasonable temperature values.

This is just a study I am doing to observe the behavior of each tube.

Any suggestions?
ashishmagar600 is offline   Reply With Quote

Old   March 10, 2020, 02:22
Default
  #2
Member
 
Ashish Magar
Join Date: Jul 2016
Location: Mumbai, India
Posts: 65
Rep Power: 5
ashishmagar600 is on a distinguished road
Just to add to my question, when I give flux in terms of Heat Transfer coefficient and ambient temperature I am getting a solution as expected.

Any reason why this is happening?
ashishmagar600 is offline   Reply With Quote

Old   March 10, 2020, 04:18
Default
  #3
New Member
 
Carlos Rubio Abujas
Join Date: Jan 2018
Location: Spain
Posts: 12
Rep Power: 4
crubio.abujas is on a distinguished road
Could it be that either of the heat fluxes [W/m2] you mentioned where actually a heat flow [W]? That may explain the radical difference in the behaviour when setting the value and that the differences disapeared when using a heat transfer coefficient.
crubio.abujas is offline   Reply With Quote

Old   March 10, 2020, 05:53
Default
  #4
Member
 
Ashish Magar
Join Date: Jul 2016
Location: Mumbai, India
Posts: 65
Rep Power: 5
ashishmagar600 is on a distinguished road
I specifically checked that I was not doing this mistake.
ashishmagar600 is offline   Reply With Quote

Reply

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
My radial inflow turbine Abo Anas CFX 27 May 11, 2018 01:44
CFD analaysis of Pelton turbine amodpanthee CFX 31 April 19, 2018 18:02
Question about heat transfer coefficient setting for CFX Anna Tian CFX 1 June 16, 2013 06:28
CFX13 Post Periodic interface EtaEta CFX 7 December 8, 2011 17:15
Heat Transfer Coeff. at Heat Flux Boundary Rushyen CFX 6 January 18, 2001 05:09


All times are GMT -4. The time now is 01:14.