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Fluid Porosity : Value ?

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Old   September 24, 2004, 03:54
Default Fluid Porosity : Value ?
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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.

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Old   September 24, 2004, 12:23
Default Re: Fluid Porosity : Value ?
Evan Rosenbaum
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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.
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Old   September 25, 2004, 01:24
Default Re: Fluid Porosity : Value ?
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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.
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Old   October 13, 2004, 18:44
Default Re: Fluid Porosity : Value ?
Ralf Schmidt
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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"

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.

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Old   October 14, 2004, 00:43
Default Re: Fluid Porosity : Value ?
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Tanks Ralf...

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

thanks once again.. -guru.
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Old   April 10, 2014, 13:49
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for porous zone ,how to define the porosity of solid in fluent?.....can anyone help?
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Old   August 18, 2014, 08:15
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Naveed Iqbal
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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.
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