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

Flow resistance model

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 10, 2008, 06:29
Default Flow resistance model
  #1
Raja
Guest
 
Posts: n/a
Dear Friends,

I am to model the radiator as volume flow reistance (using Isotropic loos model). For that I will have to get Linear and Quadtratic resistance co efficients. Kindly can anyone explain how these two coefficients are obtained in measurements and how to get these values to CFX simulations.

Thanks a lot for your valuable time and help.

Thanks and regards

  Reply With Quote

Old   March 10, 2008, 08:54
Default Re: Flow resistance model
  #2
Dr Flow Squad
Guest
 
Posts: n/a
Quadratic Resistance:

Kq = dP/dx * 1/U^2

which equals Kq = 1/dx**rho*zeta where zeta is the pressure drop coefficient : zeta = dP / Pdyn.

Similar the linear constant is determined by: Kl = dP/dx * 1/U

  Reply With Quote

Old   March 10, 2008, 09:57
Default Re: Flow resistance model
  #3
Raja
Guest
 
Posts: n/a
Thanks a lot for the explanation. I have Airflow (m3/s) and Pressure loss curve. From that how to derive these co efficients?
  Reply With Quote

Old   March 10, 2008, 13:07
Default Re: Flow resistance model
  #4
Raja
Guest
 
Posts: n/a
Hi,

Could anyone explain about determinig the Permeability of radiator? Inorder to find linear resistance co efficeient, I am in need of gettting radiator permeability details?

Thanks in advance.
  Reply With Quote

Old   March 11, 2008, 03:02
Default Re: Flow resistance model
  #5
wake
Guest
 
Posts: n/a
I think no need for permiability. convert the m3/s to m/s second by using the flow area (may be ur radiato area). Fit a curve (trend line)with only quadratic and linear terms in excel. use intercept at zero for avoiding constant term. supply this quadratic and linear terms to cfx...

hope this will help
  Reply With Quote

Old   March 11, 2008, 03:24
Default Re: Flow resistance model
  #6
Raja
Guest
 
Posts: n/a
Thanks a lot Mr. Wake. I will try in that way.
  Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to model granular flow through porous media Axius FLUENT 2 August 7, 2014 10:34
Cavitation model with non-isothermal flow pitisrisuk CFX 0 July 14, 2009 14:30
Multiphase flow. Dispersed and free surface model Luis CFX 8 May 29, 2007 18:13
Baldwin-Lomax model in wall jet flow K.S.Chang Main CFD Forum 0 December 7, 2005 01:51
Help needed to model gas-solids flow Juliana P FLUENT 3 September 21, 2005 09:42


All times are GMT -4. The time now is 21:35.