Generation and Observation of Tensile Waves in Oil Columns

Seiichi Washio, Satoshi Takahashi, Tadataka Konishi, Hitoshi Moriwake

Research output: Contribution to journalArticle

Abstract

Tensile stresses in liquids are not necessarily a familiar idea in fluid engineering, so much less accepted is the reality of tensile waves travelling through a liquid continuum. The present paper aims at giving evident proof for the premise. In a pipe with its end closed, branching from the main line where column separation is started, alternating tensile and compressive waves have been beautifully created and measured. It has turned out that the ordinary viscous wave equation can properly predict the time profiles of the masured pressures, which reveals that a tensile wave propagates in oil at the same speed as a compressive one. The observations by use of a transparent acrylic tube have also revealed the rupturing of an oil column under an excessive transient tensile stress; in the aftermath there has emerged a bubble which is usually mistaken for the cause of cavitation, but is actually brought about by diffusive separation of gas from the oil into the rupture.

Original languageEnglish
Pages (from-to)779-784
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume58
Issue number547
DOIs
Publication statusPublished - 1992
Externally publishedYes

Keywords

  • Absolute Negative Pressure
  • Cavitation
  • Oil
  • Rupture
  • Tensile Wave
  • Transient Viscous Wave

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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