Published July 1, 2001
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Journal Article
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Bubble Measurements Downstream of Hydraulic Jumps
Abstract
A phase Doppler anemometer (PDA) system was used to measure the velocity profiles and air bubble size distributions downstream of two-dimensional hydraulic jumps for different upstream flow conditions in a 1.92m long laboratory flume. The PDA detected bubbles from 1 to 500 [microns] in diameter, and more were found at the bottom of the downstream flow near the elevation of the upstream free surface. This distribution was more marked for smaller bubbles, those with diameters less that 100 [microns]. The migration of the bubbles is controlled by the effects of buoyancy and by turbulent mixing; the relative magnitude of their effects on bubble distribution depends strongly on bubble size, and also on the energy of the upstream flow.
Additional Information
Received 25 April 1999; revised 20 December 2000. Available online 20 April 2001. The authors are grateful to Professor Richard Skop at the University of Miami for use of his bubbling frits. They also acknowledge the technical assistance of Clifford Weisman at Dantec Measurement Technology and the financial support of the Office of Naval Research under grant number N00014-94-1-1210.Files
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Additional details
- Eprint ID
- 228
- Resolver ID
- CaltechAUTHORS:WANijmf01
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2004-12-14Created from EPrint's datestamp field
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