# Fluid Porosity : Value ?

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

 September 24, 2004, 03:54 Fluid Porosity : Value ? #1 guru Guest   Posts: n/a Hello For the modelling of the Porous zone, what is the usal value taken for "Fluid Porosity" (not Viscous(1/alpha) or Inertial Resistnce(C2)) for the cases where porous zone is simulating the Combi-Cooler? Thanks & regards, -guru.

 September 24, 2004, 12:23 Re: Fluid Porosity : Value ? #2 Evan Rosenbaum Guest   Posts: n/a Porosity = Volume of Fluid Divided by Total Volume A porosity of 1 is all fluid, no solid. A porosity of 0 is all solid, no fluid.

 September 25, 2004, 01:24 Re: Fluid Porosity : Value ? #3 guru Guest   Posts: n/a Thanks Evan, So in the porous zone, say if I have 20 % of solid structure, then should I have to give Porosity as 0.8? anyway thanks for the info, regards, -guru.

 October 13, 2004, 18:44 Re: Fluid Porosity : Value ? #4 Ralf Schmidt Guest   Posts: n/a Hi, if you want to simulate the flow inside the cooler, dont use porosity -> from the fluent online-user-manual: "Note that the porosity will never impact the flow velocity in the medium, [...] No matter what value you set for porosity, FLUENT predicts that the flow velocity is the superficial velocity in the medium" http://eng.snu.ac.kr/down/on-line-do...ug/node233.htm But you can use porosity together with a particle diameter to calculate C1 and C2. For example with the Ergun Equation. As for the particle diameter, I would use any kind of relevant dimension of the divices inside the cooler. Porosity is simle to calculate. Ralf

 October 14, 2004, 00:43 Re: Fluid Porosity : Value ? #5 guru Guest   Posts: n/a Tanks Ralf... I am working on it..let me see which one best predicts best results.. thanks once again.. -guru.

 April 10, 2014, 13:49 #6 New Member   rao Join Date: Apr 2014 Posts: 1 Rep Power: 0 for porous zone ,how to define the porosity of solid in fluent?.....can anyone help?

 August 18, 2014, 08:15 #7 New Member   Naveed Iqbal Join Date: Oct 2009 Location: Germany Posts: 19 Rep Power: 9 Hi Vshalrao, you can set the fluid porosity in the porous zone properties. That is basically 1-(porosity of solid). So for solid porosity = 0.4, you need to set fluid porosity = 0.6. Hope this is what you are looking for.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Attesz CFX 7 January 5, 2013 04:32 taru agrawal FLUENT 4 September 10, 2007 03:12 bioman66 CFX 5 June 3, 2006 01:40 Abhi Main CFD Forum 2 July 9, 2002 09:08 Abhi Main CFD Forum 12 July 8, 2002 09:11

All times are GMT -4. The time now is 00:24.