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Calculating pressure loss through porous plastics

Calculating pressure loss through porous plastics

Calculating pressure loss through porous plastics

(OP)
Hello everyone,

I am looking for a way to calculate the pressure loss through porous plastics, without data from a manufacturer.

Is there any global theory about this? Or is one always refered to the manufacturers data ?

Off course some information is required, like outer velocity/pressure and porosity of the material, but this is available.

Thanks in advance

RE: Calculating pressure loss through porous plastics

Darcy's law is used for pressure drop through porous media.

RE: Calculating pressure loss through porous plastics

Yes, it is true... and to use the Darcy's law you just need the permeability and the dynamic viscosity of the liquid.

RE: Calculating pressure loss through porous plastics

(OP)
I know of the Darcy-Forhheimer equation (Delta p = C1*V^2+C2*V), which relates the pressure to the velocity through the porous surface, which is the relation I want.

But the problem is that you need the coefficients C1 and C2, and I don't have those.
I could retrieve them from experiments, but I'd like to skip those. Is there a database for these kind of coefficients ?

I want to find the relation between pressure loss and velocity, and not only calculate the pressure.


RE: Calculating pressure loss through porous plastics

Threeway,

For diffusion and mass transport of liquids, vapours and gases through porous plastics, the following reference may be useful: http://www.diffusion-polymers.com/forum.htm
Regards,

Rodney
 

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