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research-article

Experimental investigation of cavitation behind a circular cylinder in cross-flow

[+] Author and Article Information
Pankaj Kumar

Department of Mechanical Engineering Indian Institute of Technology Madras Chennai 600036, INDIA
pankaj20221@gmail.com

Shamit Bakshi

Department of Mechanical Engineering Indian Institute of Technology Madras Chennai 600036, INDIA
shamit@iitm.ac.in

Dhiman Chatterjee

Department of Mechanical Engineering Indian Institute of Technology Madras Chennai 600036, INDIA
dhiman@iitm.ac.in

1Corresponding author.

ASME doi:10.1115/1.4035923 History: Received May 19, 2016; Revised September 10, 2016

Abstract

Cavitation behind a circular cylinder is studied with the aid of highly time resolved images at a constant Reynolds number of 64000. Apart from recording overall cavitation activity behind the cylinder, the study also delves into the dynamics of individual cavities. The length of cavity scales with cavitation number and this scaling is similar to the existing results obtained in flow regimes different from that presented here. Dynamics of individual cavities show distinct phases of cavity formation, growth and collapse. At lower cavitation numbers cavity collapse was followed by a rebounce. Variation of area normalized by the length of cavity shows self similarity in the growth phase of cavities for different cavitation numbers. Thus cavity length is the suitable length scale for dynamics of cavities, at least for the growth phase. The cavity lifetime scales inversely with the square of cavitation number. Dynamics of individual small cavity captured at higher frame rates was found to be similar to that of an isolated bubble. In this case, a rapid collapse follow a more gradual expansion phase, unlike that shown by larger cavities.

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