Effects of a Few Small Air Bubbles on the Performance of Circular Cylinder at Critical Flow Range in Water

[+] Author and Article Information
H. Watanabe, A. Ihara, S. Onuma

Institute of Fluid Science, Tohoku University, Sendai, Japan

J. Fluids Eng 112(1), 67-73 (Mar 01, 1990) (7 pages) doi:10.1115/1.2909371 History: Received August 23, 1988; Online May 23, 2008


In a horizontal flow channel an experimental study was made on the effects of a small amount of air bubbles on the performance of a circular cylinder at a critical flow range where the drag coefficient of the test model decreased as Reynolds number increased. The measurements of the pressure distribution and fluid forces on the cylinder, the longitudinal turbulence level in water phase and the bubble size distribution in a free stream were taken. The results indicated that a large reduction in the drag coefficient and a change of the pressure distribution around the test model were caused at the low critical flow range by introducing a very small quantity of air bubbles such as 0.05 percent, though the turbulence level in water phase did not increase.

Copyright © 1990 by The American Society of Mechanical Engineers
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