CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Numerical modelling of closed loop pulsating heat pipe with compressible flow

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 1, 2019, 01:57
Default Numerical modelling of closed loop pulsating heat pipe with compressible flow
  #1
New Member
 
Sabrina Carson
Join Date: May 2018
Posts: 15
Rep Power: 5
sabrinacarson is on a distinguished road
Dear All,

Recently I wrote an article on numerical simulation of closed loop pulsating heat pipe. The solver I used deals with codensation and Evaporation. The fluid was considered to be incompressible.

The reviewer rejected the article and argued, "The solver that is utilised here is an incompressible VOF-based solver. In this case how it operated on a closed loop domain without blowing up. How mass is conserved? The application of this solver for the specific application is questionable according to my opinion. The compressibility issue needs to be addressed."

Can anyone suggest how can I model compressible condensation and evaporation situation ? Which CFD package can deal with this situation (e.g. ANSYS, COMSOL etc.)? Or how can I make modifications in existing solvers (e.g. in OpenFOAM)?
sabrinacarson is offline   Reply With Quote

Old   December 1, 2019, 12:06
Default
  #2
Senior Member
 
Lucky Tran
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 4,438
Rep Power: 53
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
Indeed there are certain mass conservation issues when running certain scenarios in a closed domain. In short, you can run a constant density steady simulation or a compressible transient simulation.

You need to clarify what you mean by "the fluid was considered to be incompressible." The reviewer also needs to clarify what they mean by incompressible. Most solvers nowadays are not true incompressible solvers anyway (they're compressible solvers w/ an equation of state for density and have no problem). You might have "shot yourself in the foot" by even mentioning the word incompressible when it was not needed.

No idea what solver you used to comment on the applicability of any solver. Also not sure what compressibility issue is being mentioned.
LuckyTran is offline   Reply With Quote

Old   December 1, 2019, 14:25
Default
  #3
Senior Member
 
Arjun
Join Date: Mar 2009
Location: Nurenberg, Germany
Posts: 1,044
Rep Power: 28
arjun will become famous soon enougharjun will become famous soon enough
Quote:
Originally Posted by sabrinacarson View Post
Dear All,

Recently I wrote an article on numerical simulation of closed loop pulsating heat pipe. The solver I used deals with codensation and Evaporation. The fluid was considered to be incompressible.

The reviewer rejected the article and argued, "The solver that is utilised here is an incompressible VOF-based solver. In this case how it operated on a closed loop domain without blowing up. How mass is conserved? The application of this solver for the specific application is questionable according to my opinion. The compressibility issue needs to be addressed."

Can anyone suggest how can I model compressible condensation and evaporation situation ? Which CFD package can deal with this situation (e.g. ANSYS, COMSOL etc.)? Or how can I make modifications in existing solvers (e.g. in OpenFOAM)?



Ask the reviewer that pretty much all the VOF based simulations lose the mass to some degree, why only this article is objected while 10000 articles in a year are published about it.



There exist no multiphase simulation that preserves mass 100 %. I know of none.
arjun is offline   Reply With Quote

Reply

Tags
ansys, boiling, condensation, evaporation, openfoam

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
Multiphase flow - incorrect velocity on inlet Mike_Tom CFX 6 September 29, 2016 02:27
Error - Solar absorber - Solar Thermal Radiation MichaelK CFX 12 September 1, 2016 06:15
Setting the height of the stream in the free channel kevinmccartin CFX 10 July 9, 2015 22:36
Pipe flow heat transfer feedq FLUENT 10 November 26, 2014 09:23
fluid flow fundas ram Main CFD Forum 5 June 17, 2000 22:31


All times are GMT -4. The time now is 02:39.