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Scale-up criteria of square tank surface aerator

Rao, Achanta Ramakrishna and Kumar, Bimlesh (2006) Scale-up criteria of square tank surface aerator. In: Biotechnology and Bioengineering, 96 (3). pp. 464-470.

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Oxygen transfer rate and the corresponding power requirement to operate the rotor are vital for design and scale-up of surface aerators. Present study develops simulation or scale-up criterion correlating the oxygen transfer coefficient and power number along with a parameter governing theoretical power per unit volume (X, which is defined as equal to $F^{4/3}R^{1/3}$, where F and R are impellers' Froude and Reynolds number respectively). Based on such scale-up criteria, design considerations are developed to save energy requirements while designing square tank surface aerators. It has been demonstrated that energy can be saved substantially if the aeration tanks are run at relatively higher input powers. It is also demonstrated that smaller sized tanks are more energy conservative and economical when compared to big sized tanks, while aerating the same volume of water, and at the same time by maintaining a constant input power in all the tanks irrespective of their size. An example illustrating how energy can be reduced while designing different sized aerators is given. The results presented have a wide application in biotechnology and bioengineering areas with a particular emphasis on the design of appropriate surface aeration systems.

Item Type: Journal Article
Publication: Biotechnology and Bioengineering
Publisher: Wiley Interscience
Additional Information: Copyright of this article belongs to Wiley Interscience.
Keywords: Oxygen transfer coefficient;Power number;Surface aerators;Square surface aerator;Theoretical power per unit volume
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 02 Jun 2008
Last Modified: 19 Sep 2010 04:31
URI: http://eprints.iisc.ac.in/id/eprint/8364

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