Study of the hydrodynamics in a pervaporation module and implications for the design of multi-tubular systems

J. Fontalvo, E. Fourcade, P.C. Cuellar Soares, J.G. Wijers, J.T.F. Keurentjes

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    7 Citations (Scopus)

    Abstract

    CFD simulations have been carried out to describe pervaporation of org.-water mixts. with a tubular membrane. The calcd. d. and temp. profiles have been compared with expts. The profiles have been measured by ultrasound computer tomog. (UCT) for pervaporation of pure water and an ethanol-water mixt. Good agreement between the measured and calcd. d. and temp. profiles has been found. Several flow patterns have been detected depending on the d. ratio between the non-permeating and the permeating component in the mixt. For light org.-water mixts. an inversion point has been found at the membrane surface below which the flow moves downwards and above which the flow moves upwards. The inversion point is caused by the opposite effects of water concn. and temp. on the mixt. d. and consequently on the natural convection. For heavy org.-water mixts. the inversion point disappears and the flow on the membrane surface is only downward. The flux through the membrane tube increases as the d. ratio increases. For the design of multi-tubular pervaporation modules, the results suggest that for sepn. of heavy org.-water mixts. the flux is maximized with a squared configuration. On the other hand, a triangular configuration is preferred for dewatering of light org.-water mixts. [on SciFinder (R)]
    Original languageEnglish
    Pages (from-to)219-227
    Number of pages9
    JournalJournal of Membrane Science
    Volume281
    Issue number1-2
    DOIs
    Publication statusPublished - 2006

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