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Environmental Engineering Research 2011;16(1): 47-51. DOI: https://doi.org/10.4491/eer.2011.16.1.047
Investigations of Mixing Time Scales in a Baffled Circular Tank with a Surface Aerator
Bimlesh Kumar, Ajey Patel, and Achanta Rao
Civil Engineering, Indian Institute Technology Guwahati, Assam 781-039, India
Corresponding Author: Bimlesh Kumar ,Tel: +91-361-258-2420, Fax: +91-361-258-2440, Email: bimk@iitg.ernet.in
Received: May 4, 2010;  Accepted: March 7, 2011.
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ABSTRACT
The oxygen transfer rate is a parameter that characterizes the gas-liquid mass transfer in surface aerators. Gas-liquid transfer mechanisms in surface aeration tanks depend on two different extreme lengths of time; namely, macromixing and micromixing. Small scale mixing close to the molecular level is referred to as micromixing; whereas, macromixing refers to mixing on a large scale. Using experimental data and numerical simulations, macro- and micro-scale parameters describing the two extreme time scales were investigated. A scale up equation to simulate the oxygen transfer rate with micromixing times was developed in geometrically similar baffled surface aerators.
Keywords: Energy dissipation | Macromixing | Micromixing | Oxygen transfer rate | Surface aerators | Theoretical power per unit volume
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