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momentum loss equation porous media

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Old   March 17, 2012, 18:50
Default momentum loss equation porous media
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albert
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Hi,
i am modelating flow through a porous media as a simplification of a perforated difusser.
In order to obtain the same velocity profile as i did in the real perforated diffuser, i am taking different values for permeability coefficient and resistance loss coeffcient.
As far as i know, both of them define the mometum loss in the porous domain(both terms take part in the momentum loss equation), and hence the pressure drop.
would it actually be the same just changing one of these two parameters? could i get the same results by just changing one of them with a wide range of values?
is there actually any diffrenece between both of them? (i am refering to the effects on the porous media)

could anyone help me please?
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Old   March 21, 2012, 19:28
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Erik
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permeability is the linear part of the loss model. loss coefficient is the quadratic part. you can use either one or both, depending on the characteristics of your diffuser. Solver theory guide will give you the exact formula for each I cant remember of the top of my head, or can I.....

DeltaP = -(Viscosity * Velocity / K.perm) - (Density*Loss.Coefficient*Velocity^2)
units will be Pa/m
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