Mass Transfer and Diffusion - Wiley

Chapter3 mass Transfer and Diffusionbarriers, such as membranes, differing species mass -transferrates through the membrane govern equipment a binary mixture, molecular Diffusion of componentAwith respect to B occurs because of different potentialsor driving forces, which include differences (gradients)of concentration (ordinary Diffusion ), pressure (pressurediffusion), temperature (thermal Diffusion ), and external forcefields (forced Diffusion ) that act unequally on the differentchemical species present. Pressure Diffusion requires a largepressure gradient, which is achieved for gas mixtures with acentrifuge.

• Define a mass-transfer coefficient and explain its analogy to the heat-transfer coefficient and its usefulness, as an alternative to Fick’s law, in solving mass-transfer problems. • Understand the common dimensionless groups (Reynolds, Sherwood, Schmidt, and Peclet number for mass

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  Heat, Transfer, Mass, Mass transfer

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