Hello Sir,nThank you for answering. nSir will the value of loss factor, KL be equal to 0.5 if I change the porosity i.e the area the flow through the medium? If not how can I calculate it?nSir is there any reference you can provide? nFor the 2nd part that's a mistake on my part. Sorry, Sir. I meant I have the porosity data of the medium. So how can I calculate the value of C2 in any other way? I don't have the data for pressure loss vs Velocity. nSince I have the permeability data too I can calculate Viscous resistance easily.Sincerely,nUdit.n