Measurement of transiently changing flow rates in oil hydraulic column separation

Seiichi Washio, Satoshi Takahashi, Satoshi Yamaguchi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Column separation and subsequent rejoining in an oil hydraulic line usually result in tensile waves and consequent ruptures in an oil column. In order to investigate these phenomena in more detail, it is essential to precisely measure transient flow rates in column separation and rejoining. The aim of the present work is to attain this objective: a method based on the theoretical relation of the flow rate change in a pipe with a kinetically induced pressure difference between the two separate sections. Instead of a conventional differential pressure transducer, two individual pressure gauges are used to measure pressures at the two sections and find the difference between them by subtraction. Theoretically predicted stepwise decreases of the flow rate until the column rejoining have been accurately measured, showing the effectiveness of the method. It is also pointed out that the successive calculus proposed by Zhao et al., which is expected to substantially economize the procedure to obtain flow rates from differential pressure data, may give unrealistic results.

Original languageEnglish
Pages (from-to)51-56
Number of pages6
JournalJSME International Journal, Series B: Fluids and Thermal Engineering
Issue number1
Publication statusPublished - Feb 1996


  • Column Separation
  • Differential Pressure
  • Measurement
  • Oil Hydraulic
  • Rejoining
  • Transient
  • Unsteady Flow Rate

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes


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