On Diffusion and Permeation

Stephen Peppin

doi:10.1515/JNETDY.2009.018

2009-01-01

PRE

Stephen Peppin *

DOI：10.1515/JNETDY.2009.018

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摘要

En 中文

Diffusion and permeation are discussed within the context of irreversible thermodynamics. A new expression for the generalized Stokes-Einstein equation is obtained which links the permeability to the diffusivity of a two-component solution and contains the poroelastic Biot-Willis coefficient. The theory is illustrated by predicting the concentration and pressure profiles during the filtration of a protein solution. At low concentrations the proteins diffuse independently while at higher concentrations they form a nearly rigid porous glass through which the fluid permeates. The theoretically determined pressure drop is nonlinear in the diffusion regime and linear in the permeation regime, in quantitative agreement with experimental measurements.

Keyword:

BOVINE SERUM-ALBUMIN

OSMOTIC-PRESSURE

POROUS-MEDIA

HYDRAULIC CONDUCTIVITY

PROTEIN SOLUTIONS

FLOW

ULTRAFILTRATION

MODEL

SEDIMENTATION

PERMEABILITY

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期刊

Journal of Non-Equilibrium Thermodynamics

IF:

4.2

论文数:

767

被引数:

941

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