Fluid Porosity : Value ?
 

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.

Re: Fluid Porosity : Value ?
 

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.

Re: Fluid Porosity : Value ?
 

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.

Re: Fluid Porosity : Value ?
 

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

Re: Fluid Porosity : Value ?
 

Tanks Ralf...

I am working on it..let me see which one best predicts best results..

thanks once again.. -guru.

for porous zone ,how to define the porosity of solid in fluent?.....can anyone help?

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.

fluid porosity in fluent
 

hello, For the modelling of the Porous zone, what is the usal value taken for Fluid Porosity in setting ansys fluent18.2 ?? for copper foam with the porosity 0.95 and the pore size 5 ppi??? please guide me. tanks
:):)