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Bubble Measurements Downstream of Hydraulic Jumps

Waniewski, Tricia A. and Hunter, Christopher and Brennen, Christopher E. (2001) Bubble Measurements Downstream of Hydraulic Jumps. International Journal of Multiphase Flow, 27 (7). pp. 1271-1284. ISSN 0301-9322. http://resolver.caltech.edu/CaltechAUTHORS:WANijmf01

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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.


Item Type:Article
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.
Record Number:CaltechAUTHORS:WANijmf01
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:WANijmf01
Alternative URL:http://dx.doi.org/10.1016/S0301-9322(01)00003-9
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:228
Collection:CaltechAUTHORS
Deposited By: Christopher Brennen
Deposited On:14 Dec 2004
Last Modified:26 Dec 2012 08:39

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