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G-type shells in shell-and-tube heat exchangers: Gaddis, E S, Galerkin method, for heat conduction finite-element calculations, Galileo number, Gas-liquid flows: Gas-liquid-solid interfaces, fouling at, Gas-solid interfaces, fouling at, Gas tungsten arc welding, Gaseous fuels, properties of, Gases: Gaskets: Gauss-Seidel method, for solution of implicit equations, Geometric optics models for radiative heat transfer from surfaces, geothermal brines, fouling of heat exchangers by, Germany, Federal Republic of, mechanical design of heat exchangers in: Gersten, K, Girth flanges, in shell-and-tube heat exchangers, Glass production, furnaces and kilns for, Glycerol (glycerine): Gn (heat generation number), Gnielinski, V Gnielinski correlation, for heat transfer in tube banks, Gomez-Thodas method, for vapour pressure, Goodness factor, as a basis for comparison of plate fin heat exchanger surfaces, Goody narrow band model for gas radiation properties, Gorenflo correlation, for nucleate boiling, Gowenlock, R, Graetz number: Granular products, moving, heat transfer to, Graphite, density of, Grashof number Gravitational acceleration, effect in pool boiling, Gravity conveyor: Gregorig effect in enhancement of condensation, Grid baffles: Grid selection, for finite difference method, Griffin, J M, Groeneveld correlation for postdryout heat transfer, Groeneveld and Delorme correlation for postdryout heat transfer, Gross plastic deformation Group contribution parameters tables, Guerrieri and Talty correlations for forced convective heat transfer in two-phase flow, Gungor and Winterton correlation, for forced convective boiling, Gylys, J,
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Diffuse Coefficient

DOI 10.1615/hedhme.a.000507

5.2 PROPERTIES OF MIXTURES OF FLUIDS
5.2.5 Diffusion coefficients

A. Introduction

Diffusion refers here to transport of a material within one phase due to molecular characteristics alone: there is no external force or turbulence causing the transport. Diffusion can be caused by gradients within the phase created by a number of variables. The only case considered here is diffusion caused by a concentration gradient. In a binary mixture, if component A diffuses from position 1 to position 2 at a given rate, then to maintain equal molal flow, component B must diffuse at the same rate in the opposite direction. If Fm is the molal flux, the diffusion coefficient is defined as

\[\label{eq1} F^{m}_{A} = -CD_{AB}Vx_{A}\tag{1}\]

\[\label{eq2} F^{m}_{B} = -CD_{BA}Vx_{B} \tag{2}\]

where C = total molar concentration

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