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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2013007430
pages 249-264

EFFECT OF IMPACTING DISTANCE AND CONFINING PRESSURE ON CAVITATION BUBBLE COLLAPSE CHARACTERISTICS

hualin liao
China University of Petroleum
Riji Chen
PetroChina International Iraq FZE, Dubai 2993, UAE
Lei Wang
Petroleum Engineering Department, Colorado School of Mines, Golden, CO 80401, USA
Lihong Zhu
College of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580, China

SINOPSIS

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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