|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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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
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|
This work was supported by the National Natural Science Foundation of China (Grant No. 51479177).
|Corresponding Authors: Zhi-yong Dong|
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