# porous medium input - a question

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 December 10, 2002, 23:37 porous medium input - a question #1 Shankar Guest   Posts: n/a Hello all In the input parameters for porous zone we either specify the loss coeeficients 1/alpha and C1 or specify c0 and c1 for powerlaw model.How do we calculate c0 and c1 and if we are not using the powerlaw model, do we just leave the default(zero) values? Thanks

 December 11, 2002, 04:16 Re: porous medium input - a question #2 Atul T. Shinde Guest   Posts: n/a Dear friend, Can U please let me know the thickness of the porous medium u r using? If the thickness is very less then just based on the pressure drop and the superficial velocity, u can calculate the coefficient. As far as using power law is concerned, co and c1 have got units, so do not make the mistake of considering them as dimensionless. Power laws are generally used when u have got the experimental data with u.

 December 11, 2002, 14:11 Re: porous medium input - a question #3 Shankar Guest   Posts: n/a Hi Atul, I am actually modeling a packed bed.I know 1/alpha and C2 coefficients(from porosity and the particle diameter).If am notusing the powerlaw model, do I just leave it with the default values(zero)? Thanks, Shankar.

 December 12, 2002, 13:02 Re: porous medium input - a question #4 njoy Guest   Posts: n/a Try it and compare with available results for similar cases & then U Can go by trial & error.

 December 16, 2002, 13:35 Re: porous medium input - a question #5 Evan Rosenbaum Guest   Posts: n/a If you specify alpha and C2, you can just accept the default power law values (zero). If the first coefficient in a power law equation is zero, the result is always zero.

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