Wave structure in the radial film flow with a circular hydraulic jump |
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Authors: | A Rao J H Arakeri |
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Institution: | (1) Department of Mechanical Engineering Indian Institute of Science, Bangalore, India e-mail: jaywant@mecheng.iisc.ernet.in, IN |
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Abstract: | A circular hydraulic jump is commonly seen when a circular liquid jet impinges on a horizontal plate. Measurements of the
film thickness, jump radius and the wave structure for various jet Reynolds numbers are reported. Film thickness measurements
are made using an electrical contact method for regions both upstream and downstream of the jump over circular plates without
a barrier at the edge. The jump radius and the separation bubble length are measured for various flow rates, plate edge conditions,
and radii. Flow visualization using high-speed photography is used to study wave structure and transition. Waves on the jet
amplify in the film region upstream of the jump. At high flow rates, the waves amplify enough to cause three-dimensional breakdown
and what seems like transition to turbulence. This surface wave induced transition is different from the traditional route
and can be exploited to enhance heat and mass transfer rates.
Received: 25 April 2000/Accepted: 1 June 2001 |
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