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- W1992079327 abstract "Abstract Statistical heteroporosity theory is applied to the case of ultrafiltration across a membrane composed of an array of independent channels or pores. The primary question addressed is: For given values of the reflection coefficient σ, and diffusive permeability Ps, measured independently for a membrane of unknown heteroporosity, how accurately can the rejection coefficient R be predicted by using the Spiegler—Kedem expression for rejection, derived without concern for heteroporosity? For the case of applied pressure much greater than back-osmotic pressure, limits are analytically derived which show a maximum 30% relative error in R at σ → 0, and a maximum absolute error of 0.06 at σ ≅ 0.5. Experimental regions where heteroporosity effects should be largest are given explicitly. It appears that, except for these regions, the Spiegler—Kedem equation can be used to describe accurately rejection across membranes of arbitrary heteroporosity. p]For the case of appreciable solute concentration in the feedstream, a proposed test of heteroporosity consists of measurements of rejection vs. volume flux, at small and large solute concentrations. For a particular model of membrane structure called the two-pipe model it is shown that, in principle, heteroporosity can result in significant changes of rejection with concentration at a given volume flow, but for three real membranes used as examples the effects are predicted to be relatively small." @default.
- W1992079327 created "2016-06-24" @default.
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- W1992079327 date "1981-01-01" @default.
- W1992079327 modified "2023-09-24" @default.
- W1992079327 title "Effect of heteroporosity on membrane rejection coefficients" @default.
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- W1992079327 doi "https://doi.org/10.1016/s0376-7388(00)82140-7" @default.
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