Korean Journal of Chemical Engineering

, Volume 28, Issue 2, pp 502–506

Mass transfer and shear rate in baffled surface aerator


    • Department of Civil EngineeringIndian Institute of Technology
  • Ajey Kumar Patel
    • Department of Civil EngineeringIndian Institute of Science
  • Achanta Ramakrishna Rao
    • Department of Civil EngineeringIndian Institute of Science
Invited Review Paper

DOI: 10.1007/s11814-010-0377-2

Cite this article as:
Kumar, B., Patel, A.K. & Rao, A.R. Korean J. Chem. Eng. (2011) 28: 502. doi:10.1007/s11814-010-0377-2


The scale up or scale down of the process variables in a surface aerator requires information about the shear rate prevailing in the system. In fact, the performance of surface aerator depends upon the shear rate. Shear rate affects the mass transfer operation needed by the surface aerator. Theoretical analysis of shear rate suggests a nonlinear behavior with rotational speed of the impeller, which has been shown in the present work. Present work also shows that in a geometrically similar system of baffled surface aerator, shear rate can be used as a governing parameter for scaling up or down the mass transfer phenomena.

Key words

Mass Transfer RateMixingPower NumberShear RateSurface Aeration

Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2010