年間 12 号発行
ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684
Indexed in
EFFECT OF IMPACTING DISTANCE AND CONFINING PRESSURE ON CAVITATION BUBBLE COLLAPSE CHARACTERISTICS
要約
For the purpose of understanding the effects of standoff distance and confining pressure on erosion characteristics of a cavitation jet, the collapsing process of a cavitation bubble was simulated with the volume-of-fluid (VOF) model. In the numerical simulation, the effect of initial distance between the cavitation bubble and the impact surface and the magnitude of confining pressure was analyzed on bubble collapse shape, collapse time, pressure impulse, and velocity of a micro-jet. The results reveal that the numerical calculation agrees well with experiments for the detailed collapse process of a bubble; the VOF model can accurately calculate the pressure impulse and the micro-jet's velocity, which are hard to measure in experiments. It is also thought that the cavitation erosion of cavitating jets on an impact target is mainly due to high-pressure impulse rather than the micro-jets formed during bubble collapse, because of the magnitude of the former being far more than the latter. The magnitude of the pressure impulse and velocity of micro-jets is closely related to the initial distance and confining pressure, which influence erosion characteristics of a cavitation jet.
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Ghorbani Morteza, Alcan Gokhan, Sadaghiani Abdolali Khalili, Mohammadi Ali, Unel Mustafa, Gozuacik Devrim, Koşar Ali, Characterization and pressure drop correlation for sprays under the effect of micro scale cavitation, Experimental Thermal and Fluid Science, 91, 2018. Crossref
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Liao Hua-lin, Zhao Sheng-li, Cao Yan-feng, Zhang Lei, Yi Can, Niu Ji-lei, Zhu Li-hong, Erosion characteristics and mechanism of the self-resonating cavitating jet impacting aluminum specimens under the confining pressure conditions, Journal of Hydrodynamics, 32, 2, 2020. Crossref