Porous media definition

Fededea

Hello,

I am simulating a flow through a filter. 

I have the drawing of the filter (is a oil filter cartridge) and QxdP chart.

I have modelled the circuit with the filter medium. Then I imposed porous media to the solid of the filter medium.

My doubts are:

• How can I define the thickness? What is the thickness? Is it correct to use the distance between crest and throat of a wave?
• When I put the data of dP HW ask me the velocity how can I calculate this with the know flow rate? Is it correct to use the filtration area and use Q=vA?
• Permability of the filter in the three direction: how can I set these data with only knowing the QxdP?
• The filter is cilidrical is better to use cilindrical porous media or cartesian? Where is better to put the orientation vector? Is it the same if it is consistent with the real direction of the flow rate?

Thanks in advance.

 

acupro

I would probably start by trying with cylindrical porous medium definition.  The axis would be two points that lie on the axis of the filter.

You're looking for velocity versus pressure drop.  If you have flow rate versus pressure drop I would try using the area at the mid-cylinder of the filter to back out the average velocity.

If the flow essentially goes from the inner diameter to the outer diameter, then the radial porosity would be 1 with the axial and tangential less than that - say 0.001.  The porosity values are essentially factors to control the flow directionality somewhat.  The distance between the inner diameter and the outer diameter would be the defined thickness.

Maybe try those and see if the results are sensible.