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

S. Washio, Satoshi Takahashi, Y. Uda, T. Sunahara

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

It is known that the traditional 'nucleus' theory for cavitation is incompatible 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 beam transmission, pressure and noise measurements, and luminescence and electrical charge detection. It was revealed that, at the incipient stage of cavitation, one stationary microscopic cavity always emerges suddenly on the inlet edge. Light emission was also observed in the cavitation together with electrostatic charge. All the findings taken together, which cannot be consistently explained by nucleus theory, lead to the following hypothesis: at the separation point a tensile force rips a liquid particle from the wall, leaving behind a vacuum space, which forms the incipient stationary cavity on the edge.

Original languageEnglish
Pages (from-to)373-386
Number of pages14
JournalProceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
Volume215
Issue number4
DOIs
Publication statusPublished - 2001

Fingerprint

cavitation flow
Cavitation
hydraulics
constrictions
Oils
oils
Hydraulics
electrostatic charge
cavities
nuclei
photography
Light emission
Photography
pressure measurement
noise measurement
Acrylics
Laser beams
light emission
Luminescence
Electrostatics

Keywords

  • Cavitation
  • Electrostatic charge
  • Gas diffusion
  • Hydraulic oil flow
  • Inception mechanism
  • Light Emission
  • Nucleus
  • Vacuum space

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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