Fluid Transient Phenomena Accompanied with Column Separation in Fluid Power Pipeline : 1st Report, On the Horizontal Pipeline Downstream of a Valve Instantaneously Closed

A mathematical model capable of predicting a pressure rise associated with cavity collapse and cavitation duration following a column separation with accuracy enough for practical usage, on the downstream side of a valve instantaneously closed in a fluid power pipeline, was investigated. Particular...

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Bibliographic Details
Published in:Bulletin of JSME 1984, Vol.27(233), pp.2421-2429
Main Authors: KOJIMA, Eiichi, SHINADA, Masaaki, SHINDO, Kenichi
Format: Article
Language:English
Subjects:
Air Release
Cavity Collapse
Column Separation
Fluid Power Systems
Fluid Transient
Pressure Fluctuation
Pressure Rise
Transient Cavitation
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Summary:A mathematical model capable of predicting a pressure rise associated with cavity collapse and cavitation duration following a column separation with accuracy enough for practical usage, on the downstream side of a valve instantaneously closed in a fluid power pipeline, was investigated. Particular attention has been paid to assessing the effect of gas released from liquid during the growing phase of the cavity. For that purpose, mechanism of commencement, growth and collapse of gas bubbles and volume of gas released were observed by using a valve made of transparent acrylic resin and a high speed camera. So far as the timing and pressure peak upon collapse of the first cavity are concerned, the predicted results from the present "gas-nonbubbly flow" model, in which the effects of gas released at the separated cavity and of an unsteady shear resistance in pipe flow were considered, agreed with the measured results within 5 per cent at worst.
ISSN:0021-3764
1881-1426
DOI:10.1299/jsme1958.27.2421