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- W2110653036 abstract "ABSTRACT Back‐pulsing to reduce concentration polarization in a reverse osmosis process is studied in this article by solving the convection–diffusion equation. This was observed that the concentration depolarization starts with dispelling the concentrated layer from the membrane surface, followed by rapid homogenization of the boundary layer. The time taken to accomplish the aforementioned steps depends on the extent of polarization prior to back‐pulse. The stopping of forward flux has substantial depolarizing effect on the boundary layer. The gain from this scheme, after accounting for the loss of permeate to the feed stream, is found to decrease with increase in forward filtration time, reverse flux, or the duration over which the reverse flow is continued. Also, the gain is studied as function of bulk concentration and transmembrane pressure differential. In cross‐flow mode, the expulsion of concentrated layer from the membrane surface is observed. However, the concentration gradient for back‐mixing is not substantial in the presence of cross‐flow. The gradient in concentration along the distance from the inlet end is preserved when the fluid layer is pushed away from the membrane surface during reverse flow. © 2012 Curtin University of Technology and John Wiley & Sons, Ltd." @default.
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- W2110653036 date "2012-10-19" @default.
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- W2110653036 title "Effect of pressure pulsing on concentration boundary layer over membrane-a numerical investigation" @default.
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- W2110653036 doi "https://doi.org/10.1002/apj.1690" @default.
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