CONCENTRATION POLARIZATION ANALYSIS AT THE ENTRANCE REGION OF A FLAT SHEET PERVAPORATION MODULE FOR VOC REMOVAL |
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Authors: | Sean X. Liu Pavan Mamidipally Ming Peng Leland M. Vane |
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Affiliation: | a Department of Food Science, Rutgers University, New Brunswick, New Jersey, USAb National Risk Management Research Laboratory, U.S. Environmental Protection Agency, Cincinnati, Ohio, USA |
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Abstract: | Concentration polarization is a phenomenon that is inherent in all membrane separation processes, which is difficult if not impossible to measure experimentally. Concentration polarization in a pervaporation module causes flux decline and is therefore an important issue in predicting the performance of the membrane unit for evaluation and optimization. Short-form (small L/D ratio) membrane configurations, commonly used for membrane evaluations or certain material separations, compound the complexity of process modeling that addresses concentration polarization since a substantial portion of the membrane flow channel would be considered as an “entrance region” based on the flow profile that is not fully developed. This article employed the classic boundary layer theory, combined with mass transfer phenomena in a pervaporation process that is used in volatile organic compound (VOC) removal from contaminated water sources, to theoretically analyze the concentration polarization severity in the entrance region of a flat sheet membrane module. |
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Keywords: | Pervaporation Concentration polarization Boundary layer theory VOC removal Hydrodynamic entrance region Mass transfer modeling and simulation |
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