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. Thermal Diffusion columns or cascades can beemployed to separate liquid and gas mixtures by establishingatemperature gradient.

mass transfer might be superimposed on that flow. Mass transfer is not the flow of solids on a conveyor belt. Mass transfer occurs by two basic mechanisms: (1) molecular diffusionby random and spontaneous micro-scopic movement of individual molecules in a gas, liquid, or solid as a result of thermal motion; and (2) eddy (turbulent)

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  Transfer, Mass, Conveyor, Mass transfer

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