| Description |
viii, 86 leaves : illustrations ; 29 cm |
| Summary |
"The object of this investigation was to study the mass transfer coefficients through porous water-repellent membranes, and their dependence on membrane thickness and rates of heating, and to compare experimental correlations with theoretically based equations. The membranes used during the experimental work were made of glass fiber treated with Teflon suspension and aluminum sulfate. The mechanism involves evaporation and condensation on opposite sides of a vapor-filled porous membrane. Salt water evaporates from one interface of a non-wettable, porous membrane, diffuses through the vapor filled pores, and condenses to fresh water at the other interface of the membrane. This transfer may be brought about by applying sufficient heat to the salt solution, which will produce the temperature and vapor pressure driving forces. The experimental data and results show that, as the membrane thickness and temperature difference increase, mass transfer coefficients decrease. Correlations have been developed between the experimental data and theoretically based equations. During the investigation, it was observed that the mass transfer rate varies from 0.14 to 0.86 lb./hr.sq.ft.in.Hg. corresponding to fluxes of 0.19 to 1.32 lb./hr.sq.ft"--Abstract, leaf ii. |
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