"Evaporation of water through nonwettable porous membranes has been studied under various pressures with various membrane thicknesses. The results of previous investigations at 1 atmosphere have been correlated into one equation for mass transfer resistance which has also been found to fit approximately new data obtained of 1.5, 2, and 3 atmospheres in this investigation. In the new data fluxes varied from 0.064 to 0.691 lb./ft.²/hr. through glass fiber-Teflon membrane from 0.02 to 0.08 inch in thickness. Temperatures ranged for 80 to 260°F. A more theoretical equation has been developed to explain variations from the equations based on 1 atmosphere data. This equation fits data under all pressures studied and is based on ordinary diffusion theory extended to include Knudsen diffusion effects, theoretical heat conduction through the membrane, and liquid film heat transfer coefficients. A relationship is also developed for mass transfer if concentration build-up is appreciable, and equations are given for the heat conducted through the membrane"--Abstract, page ii.
Findley, Marshall E., 1927-1991
Crosser, Orrin K.
Schwartz, Henry G.
Wellek, Robert M.
Chen, T. S.
Chemical and Biochemical Engineering
Ph. D. in Chemical Engineering
University of Missouri--Rolla
xii, 106 pages
© 1969 Chung-Liang Yeh, All rights reserved.
Dissertation - Open Access
Heat -- Transmission
Membranes (Technology) -- Materials
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Yeh, Chung-Liang, "Mass and heat transfer through nonwettable porous membranes" (1969). Doctoral Dissertations. 2206.