Journal of Applied Electrochemistry

, Volume 20, Issue 1, pp 145–149 | Cite as

Mass transfer in gas sparged membrane cells

  • G. H. Sedahmed
  • M. M. Naim
  • M. Y. Haridi


Rates of mass transfer for the transfer of NaCl across a high permeability Cuprophane membrane in a gas-stirred batch dialysis cell were measured by the conductivity method. Gas sparging was found to increase the rate of mass transfer across the membrane by an amount ranging from 18 to 360% depending on the superficial gas velocity and the physical properties of the solution. The overall mass transfer coefficient was related to the superficial velocity by the equation
$$K = aV_s^{0.22} .$$

The implication of the results for industrial membrane separation processes such as dialysis and electrodialysis is discussed.


Permeability Mass Transfer Transfer Coefficient Mass Transfer Coefficient Separation Process 



membrane area

a, a1,a2,a3 andb



salt concentration at timet in compartment 1


salt concentration at timet in compartment 2


initial salt concentration in compartment 1


diffusivity of the salt


Froude number (V s 2 /lg)


acceleration due to gravity


cell current


mass transferJ factor (St Sc0.66)


overall mass transfer coefficient


liquid phase mass transfer coefficients


membrane height


membrane permeability


cell resistance


Reynolds number (∂Vsl/μ)


Stanton number (K/Vs)


Schmidt number (ν/D)


time of dialysis


superficial gas velocity


solution volume in each compartment


gas hold-up (void fraction)

solution density


solution viscosity


kinematic viscosity

θ0, θ

specific conductivity of electrolyte and electrolyte-gas dispersion respectively


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Copyright information

© Chapman and Hall Ltd. 1990

Authors and Affiliations

  • G. H. Sedahmed
    • 1
  • M. M. Naim
    • 1
  • M. Y. Haridi
    • 1
  1. 1.Chemical Engineering Department, Faculty of EngineeringAlexandria UniversityAlexandriaEgypt

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