ISSN:
1573-1987
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Mass transfer in laminar flow due to combined convection and diffusion through porous, tubular and flat membranes which have wall resistance has been examined. The analysis is an extension of the Graetz method and includes membrane resistance, membrane partition coefficients and fluid injection and extraction. The results are expressed as a comparison of mass transfer with wall convection to mass transfer without wall convection. Mass transfer with wall convection can be stated in terms of an overall mass transfer coefficient alone when the overall mass transfer coefficient is defined in terms of the wall Sherwood number, modified Graetz number and membrane partition coefficient. It was found that mass transfer with wall convection, when expressed as a function of the dimensionless mass transfer coefficient, is independent of the wall Sherwood number and membrane partition coefficient for the normal range of mass transfer parameters. A simple empirical relationship involving only the fluid extraction ratio and dimensionless mass transfer coefficient fits the composite mass transfer results for both tubes and flat plates. A series of experiments utilizing a tubular mass exchanger verified the theoretical predictions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00418861
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