Separation Flow in Matrices - Redefinition of Friction Coefficients

Abstract

Separation flow through matrices or membranes is generally characterized by three phenomenological coefficients. Of these the hydraulic permeability L_p and the reflection coefficient σ are the most commonly discussed. Their theoretical interpretation is much aided by the use of friction coefficients ${\hat{\mathit{f}}}_{\ell \mathit{m}}$ defined to characterize the relative interaction in flow of the thermodynamic component ℓ in its movement past m. It is shown that this definition can be further simplified and that as a result simplified expressions notably for L_p result.