Tortuosity $$ is define as :

$=(\frac{L_a}{L})$

Which is appropriate for sorting changing.

Specific surface area is defined as:

$A_S=(Total$ area $\frac{?}{?}$ Unit Volume$)$

$A_s=\frac{2RLN}{S^{2}L}$

Determine:

A relationship between the flow $Q$ and the number of tubes $(N)$ and

A relationship between the flow $Q$ and specific surface area. $(A_s)$

What do these relationships imply about porosity and permeability changes due to the change

of sorting?

$($this is an old HW question I failed. Now it is suspected to be on the test. Will thumbs up$)$