Occurrence of Bubbles in a Thin Wire at Low Reynolds Number

[+] Author and Article Information
K. Sato

Mechanical Engineering Department, Kanazawa Institute of Technology, Ishikawa 921, Japan

J. Fluids Eng 114(2), 255-260 (Jun 01, 1992) (6 pages) doi:10.1115/1.2910024 History: Received February 22, 1990; Online May 23, 2008


Thin wires of various diameters from 0.07 to 0.7 mm are examined about appearances and characteristics of bubble occurrence behind them in the range of low Reynolds numbers. The appearance of bubbles is very dependent on diameters of wires. Two different types of bubbles can be observed in the present experiment. One is a streamer-type bubble for smaller wires and the other is a small unspherical bubble for larger wires. The incipient and the desinent values of cavitation number also change greatly with the bubble types. The streamer-type bubble is related to the presence of laminar separation zone and the growth due to air diffusion. The small unspherical bubble can be mainly attributed to the motion of rolled-up vortices and the growth due to vaporization.

Copyright © 1992 by The American Society of Mechanical Engineers
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