| 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
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Received: May 4, 2010; Accepted: March 7, 2011. |
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| ABSTRACT |
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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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