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Rectangular Surface Aerators

Rao, ARK and Kumar, Bimlesh and Patel, Ajey (2005) Rectangular Surface Aerators. In: Journal of Environmental Science & Engg, Vol. 4 (No-1). pp. 47-52.

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Abstract

Aeration experiments were conducted in two rectangular surface aeration tanks of L/B ratios 1.5 and 2 along with a square tank (L/B=1) to study their relative performance on oxygen transfer process while re-aerating the same volume of water such that the cross-sectional area of all the three tanks is the same. Experiment were carried out with an objective to find the shape effect on oxygen transfer coefficient k under a wide range of dynamic condition (variable X-the parameter governing power per unit volume) for rectangular tanks. An identical rotor with six flat blades was used in all the three tanks. The geometric dimensions, which were developed to produce maximum aeration in square tanks by a previous study,were used in the present study. Results have confirmed that at lower values of X (X<0.8) non dimensional oxygen transfer coefficient (k) is maximum in square tanks followed by rectangular tank of L/B=2 and it is the least in rectangular tank of L/B=1.5. However the rectangular tank of L/B=1.5 produces always lower k values for any given rotor speed when compared to square tank, whereas the performance of rectangular tank of L/B=2 is slightly better than square tanks when rotor speeds are higher.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to NEERI, India.
Keywords: Surface aerators;Rectangular surface aerators;oxygen transfer coeffcient
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 13 Feb 2007
Last Modified: 19 Sep 2010 04:19
URI: http://eprints.iisc.ernet.in/id/eprint/3567

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