Study on cavitation inception in hydraulic oil flow through a long two-dimensional constriction

Citation
S. Washio et al., Study on cavitation inception in hydraulic oil flow through a long two-dimensional constriction, P I MEC E J, 215(J4), 2001, pp. 373-386
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
ISSN journal
1350-6501 → ACNP
Volume
215
Issue
J4
Year of publication
2001
Pages
373 - 386
Database
ISI
SICI code
1350-6501(2001)215:J4<373:SOCIIH>2.0.ZU;2-7
Abstract
It is known that the traditional 'nucleus' theory for cavitation is incompa tible with certain facts physically and experimentally recognizable in oil hydraulic flows. In order to re-examine this issue, cavitation of hydraulic oil flow through a long two-dimensional acrylic constriction was observed by various techniques: stroboscopic photography with a microscope, laser be am transmission, pressure and noise measurements, and luminescence and elec trical charge detection. It was revealed that, at the incipient stage of ca vitation, one stationary microscopic cavity always emerges suddenly on the inlet edge. Light emission was also observed in the cavitation together wit h electrostatic charge. All the findings taken together, which cannot be co nsistently explained by nucleus theory, lead to the following hypothesis: a t the separation point a tensile force rips a liquid particle from the wall , leaving behind a vacuum space, which forms the incipient stationary cavit y on the edge.