Journal
OCEAN ENGINEERING
Volume 209, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2020.107516
Keywords
Submerged cavitation jet; Micro-particles; High-speed visualization; Cavitation noise; Cavitation erosion
Funding
- National Natural Science Foundation of China [U1562212]
- Chinese Ministry of Science and Technology [2016YFE0124600]
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing [PRP/open-1610]
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Silica sand micro-particles are added into submerged cavitation jet to enhance its cavitation intensity and erosion ability. The micro-particles promote cavitation as additional heterogeneous nuclei and the activated cavitation bubbles can accelerate micro-particles. The synergistic effect of micro-particles and cavitation bubbles helps to improve the erosion ability of jet. High-speed visualization, cavitation noise measurement, and erosion test are performed to validate the improved cavitation intensity and erosion ability of submerged cavitation jet with micro-particles. The high-speed filming shows the disappearance of the periodic shedding of cavitation cloud and the massive expansion of cavitation region when micro-particles are present. The acoustic power of cavitation noise rises by at most 113.24%. The cavitation intensity of jet increases with increasing micro-particle concentration and decreasing micro-particle size. The erosion test of sandstone shows that submerged cavitation jet with micro-particles increases the mass loss and the surface roughness by at most 86.96% and 128.28%. The changes of macroscopic erosion pattern and microscopic surface morphology are also elucidated.
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