porous media resistance coefficients
hi all,
iam analysing an airfilter.(porousmedium).for the medium,i calculated resistance coefficients .the permeability given 24 CFM, that i converted into 8584e10 1/sq.meter for viscous coeff.problem is 3D and flow is in x direction. my questions, is my coeff. value is reasonable?. i gave resistance co efficients only in x direction,should i give in other directions? if i need to give,can i use the same value ? thanks for any suggestions. regards Thiyaga. 
Re: porous media resistance coefficients
Your permeability is not unreasonable for a fairly restrictive filter. If you have xdirection flow only, you should can specify the y and z direction permeabilities to an order of magnitude or two higher than your xdirection value.

Re: porous media resistance coefficients
thank you. as you said, the permeability values in y&z are higher than the value of X, the resistance coefficients in y&z should be lower than the value in x direction, is it so?. what about inertial coefficient, the same way can be used?. looking forward to your suggestion.... regards Thiyaga.

Re: porous media resistance coefficients
The permeability inputs to FLUENT should be larger in the y and z directions. This is because the FLUENT input is actually the inverse of permeability. You can also do the same with IRF.

I want to model a micro filter, This filter (membrane) is rectangular (10×5 cm) with the thickness 12e5. so,I calculate this parameters from Ergun equation which D=1e6, because of the Micro filter type. is this assumption true??
i think this is very thin filter so there in not flow through in the membrane, in this situation is inertial coefficieant higher in Y direction? or not?when i set ydirection inertial coefficient higher than xdirection got better answer! is this resonable? I am looking forward to hearing from you. Sincerely yours 
regarding porous medium
Sir,
I am modelling porous medium. I know velocity=5.6m/s pressure=5690 pa discrete phase model thicknes of porous medium=0.15mm porosity =0.95 now how to calculate K and c2? Quote:

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