|March 29, 2011, 10:39||
Porosity PPI : how convert in % ?
Join Date: Dec 2009
Posts: 41Rep Power: 9
i have a question about modeling a porous media.
I have as information for my porous media its PPI , pores per inch(40 or 50 foe ex.).
Fluent input for porosity is instead in % (fluid volume/media volume).
How could i convert ppi to percentage?
|February 15, 2012, 11:03||
Join Date: Jun 2010
Posts: 1Rep Power: 0
You must have at least two of these four informations: porosity, mean pore diameter, mean particle diameter and pore density. You can relate mean pore diameter and mean particle diameter with the expression:
If you already have the mean particle diameter value, you can use this expression directly:
All diameters given in meters. It's easy to deduce these expressions if you consider one particle for each pore and consider the porous media as arranjed spheres. Another hint is if you have the permeability (K) value and mean particle diameter, so using Ergun's expression, you got:
Where b=144 for most porous cases.
Last edited by samuraiufrn; February 15, 2012 at 11:36.
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