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Porous medium modelling with porosity

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Old   November 30, 2018, 10:11
Default Porous medium modelling with porosity
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Pradeep Aadi
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Hi,
I want to model porous media in STAR CCM+, The only input I have is porosity of the material.
My objective is to predict pressure drop across this porous material

(I mean I cannot calculate inertial and viscous co-efficients with the inputs that I have)

Can I model the porous medium with only porosity as input?
If yes, How to go about it?

If not possible, Any alternative suggestions?

Thanks a lot
Pradeep
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Old   November 30, 2018, 13:43
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Lucky Tran
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You need the inertial and viscous coefficients because these define the pressure drop characteristics of the media. The porosity is not enough. The porosity is simply a measure of how much space is occupied by the material (i.e. like a density). You are basically asking "if I know the density of a fluid if I can predict the pressure drop it experiences in any type of flow?" Read some papers on the type of porous material that you have and see if you can find out what these coefficients are. If not, then you are shit out of luck. Pull out your random number generator....

There are models/correlations for how to estimate the viscous/inertial coefficients using only the porosity. A popular one is based on water flow through a packed bed of spheres.

Also, few experimenters even bother to measure the inertial coefficient (they assume that it is 0). Maybe you can do the same and set the inertial coefficient to 0 as a starting point.
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Old   November 30, 2018, 14:00
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Pradeep Aadi
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Thanks a lot for the suggestion Tran!
I am looking into few papers for viscous and inertial resistance calculation

Regards
Pradeep
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porous formulation, porous media input, porous media model

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