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Membrane Water Treatment
  Volume 3, Number 3, July 2012 , pages 151-168

Gas sparged gel layer controlled cross flow ultrafiltration: A model for stratified flow regime and its validity
Vivek Khetan, Ashish Srivastava and Sirshendu De

    Gas sparging is one of the techniques used to control the concentration polarization during ultrafiltration. In this work, the effects of gas sparging in stratified flow regime were investigated during gel layer controlling cross flow ultrafiltration in a rectangular channel. Synthetic solution of pectin was used as the gel forming solute. The liquid and gas flow rates were selected such that a stratified flow regime was prevalent in the channel. A mass transfer model was developed for this system to quantify the effects of gas flow rates on mass transfer coefficient (Sherwood number). The results were compared with the case of no gas sparging. Gas sparging led to an increase of mass transfer coefficient by about 23% in this case. The limitation of the developed model was also evaluated and it was observed that beyond a gas flow rate of 20 l/h, the model was unable to explain the experimental observation, i.e., the decrease in permeate flux with flow rate.
Key Words
    air sparging; stratified flow; gel layer; mass transfer coefficient; permeate flux
Department of Chemical Engineering; Indian Institute of Technology, Kharagpur, Kharagpur – 721302, India

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