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Received March 29, 2010
Accepted July 15, 2010
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Mass transfer and shear rate in baffled surface aerator
Department of Civil Engineering, Indian Institute of Technology, Guwahati 781039, India 1Department of Civil Engineering, Indian Institute of Science, Bangalore, India
bimlesh.iisc@gmail.com, bimk@iitg.ernet.in
Korean Journal of Chemical Engineering, February 2011, 28(2), 502-506(5), 10.1007/s11814-010-0377-2
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Abstract
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.
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Hu WS, Meier J, Wang DIC, Biotechnol. Bioeng., 28, 122 (1981)
Rao AR, Kumar B, Korean J. Chem. Eng., 25(6), 1338 (2008)
Martens DE, Gooijer CD, van der Velden-de Groot CAM, Beuvery EC, Tramper J, Biotechnol. Bioeng., 41, 429 (1993)
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Metz B, Kossen NWF, Suijdam JC, Adv. Biochem. Eng., 11, 103 (1979)
Nagata S, Mixing Principles and applications, John Wiley & Sons, New York, USA (1975)
Perez JAS, Porcel EMR, Lopez JLC, Sevilla JMF, Chisti Y, Chem. Eng. J., 124(1-3), 1 (2006)
Rushton JH, Costich EW, Everett HJ, Chem. Eng. Prog., 46, 395 (1950)
Rushton JH, Costich EW, Everett HJ, Chem. Eng. Prog., 46, 467 (1950)
Metzner AB, Otto RE, AIChE J., 3, 3 (1957)
Campesi A, Marcel OC, Carlos OH, Alberto CB, Bioprocess Biosyst. Eng., 32, 241 (2009)
Cho HB, Park YH, Korean J. Chem. Eng., 20(2), 262 (2003)
Myers K, Fasano J, Bakker A, Gas dispersion using mixed high-efficiency/disc impeller systems, Proceedings of the 8th European Conference on Mixing, 64-72. Institution of Chemical Engineers,London (1994)
Wu H, Chem. Eng. Sci., 50(17), 2801 (1995)
Rao ARK, Jyothish S, Oxygen transfer in circular surface aeration tanks with and without baffles, in International Conference on Industrial Pollution and Control Technologies, Jawaharlal Nehru Technological University (JNTU), Hyderabad, India, 17-19 November (1997)
Lewis WK, Whitman WG, Ind. Eng. Chem., 16, 1215 (1924)
W. E. F. and A. S. C. E. Manual of practice for water pollution control, Aeration a waste water treatment process. Water Environment Federation, Alexandria, Va., and ASCE, New York (1988)
Liu K, Neeld K, Simulation of Mixing and Heat Transfer in Stirred Tanks with VisiMix® Solutia Inc., Topical Conference on Process Development from Research to Manufacturing: Industrial Mixing and Scale-up, AIChE Annual Meeting, Dallas, TX (1999)
Kumar B, Rao ARK, Bioresour. Technol., 100, 2886 (2009)
Badino AC, Facciotti MCR, Schmidell W, Biochem. Eng. J., 8, 111 (2001)
Rao AR, Kumar B, J. Chem. Technol. Biotechnol., 82(1), 101 (2007)
Deckwer WD, Nguyen-Tien K, Schumpe A, Serpemen Y, Biotechnol. Bioeng., 24, 461 (1982)
Godbole SP, Schumpe A, Shah YT, Carr NL, AIChE J., 30, 213 (1984)
Merchuk JC, Ben-zvi B, Chem. Eng. Sci., 47, 3517 (1992)
Nakanoh M, Yoshida F, Ind. Eng. Chem. Process Des. Dev., 19, 190 (1980)
