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Membrane Water Treatment
  Volume 3, Number 1, January 2012 , pages 51-62

Effects of ring number and baffled-ring distances on ultrafiltration in the tubular membrane inserted concentrically with a ring rod
Ho-Ming Yeh, Chii-Dong Ho and Cha-Hsin Li

    The permeate flux declination along an ultrafilter membrane is due mainly to the concentrationpolarization resistance increment and the decline in transmembrane pressure. It was found in previous works that the concentration polarization resistance could be reduced in a ring-rod tubular membrane ultrafilter using the turbulent behavior. In the present study, the performance was further improved by properly and gradually decreasing the baffled-ring distance along the cross-flow channel coupled with properly adjusting the number of baffled rings. This theoretical analysis is based on the mass and momentum balances as well as the application of the resistance-in-series model. The correlation predictions are confirmed with the experimental results for dextran T500 aqueous solution ultrafiltration.
Key Words
    ultrafiltration; tubular membrane; ring-rod insert; baffled-ring distance; proper ring number
Energy and Opto-Electronic Materials Research Center,Department of Chemical and Materials Engineering,
Tamkang University, Tamsui, Taipei County251, Taiwan

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