Water Science and Engineering 2020, 13(2) 145-153 DOI:   https://doi.org/10.1016/j.wse.2020.06.004  ISSN: 1674-2370 CN: 32-1785/TV

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Cavitating flow
Circular multi-orifice plate
PIV technique
High-speed photography
Turbulence characteristics

PIV analysis and high-speed photographic observation of cavitating flow field behind circular multi-orifice plates

Zhi-ping Guo a, b, Xi-huan Sun a, Zhi-yong Dong c, *

a College of Hydro-Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
b Department of Transportation Engineering, Shanxi Conservancy Technical Institute, Yuncheng 044004, China
c College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China


Based on a self-developed hydrodynamic cavitation device with different geometric parameters for circular multi-orifice plates, turbulence characteristics of cavitating flow behind multi-orifice plates, including effects of orifice number and orifice layout on longitudinal velocity, turbulence intensity, and Reynolds stress, were measured with the particle image velocimetry (PIV) technique. Flow regimes of the cavitating flow were also observed with high-speed photography. The experimental results showed the following: (1) high-velocity multiple cavitating jets occurred behind the multi-orifice plates, and the cavitating flow fields were characterized by topological structures; (2) the longitudinal velocity at each cross-section exhibited a sawtooth-like distribution close to the multi-orifice plate, and each sawtooth indicated one jet issuing from one orifice; (3) there were similar magnitudes and forms for the longitudinal and vertical turbulence intensities at the same cross-section; (4) the variation in amplitude of Reynolds stress increased with an increase in orifice number; and (5) the cavitation clouds in the flow fields became denser with the increase in orifice number, and the clouds generated by the staggered layout of orifices were greater in number than those generated by the checkerboard-type one for the same orifice number. The experimental results can be used to analyze the mechanism of killing pathogenic microorganisms through hydrodynamic cavitation.

Keywords Cavitating flow   Circular multi-orifice plate   PIV technique   High-speed photography   Turbulence characteristics  
Received 2019-07-04 Revised 2020-02-14 Online: 2020-06-30 
DOI: https://doi.org/10.1016/j.wse.2020.06.004

This work was supported by the National Natural Science Foundation of China (Grant No. 51479177).

Corresponding Authors: Zhi-yong Dong
Email: dongzy@zjut.edu.cn
About author:


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