[wschao90]

Hello everyone

I am now reading the flunet user guide about how to calculate Inertial resistance and viscous resistance.

But somehow I saw someone wrote this on the internet

alpha = (D/150)*(epsilon^3/(1-epsilon)^3)
C2=(3.5/D)*(1-epsilon)/epsilon^3

I only know that
1/alpha=viscous resistance
and
C2=Inertial resistance

but he didn't said what D and epsilon stands for

Does anyone know that where these equations come from?
Thanks in advance!

[LuckyTran]

I think it comes from a correlation from packed beds (flow through soil). alpha is the permeability, epsilon is the porosity and d is the particle diameter. You have to be careful if epsilon is the area or volume porosity.