High-Speed Observations of Highly Erosive Vortex Cavitation around Butterfly Valve

In order to clarify the mechanism of the severe erosion mainly resulting from the singular vortex cavitation, we carefully observe the vortex cavitation associated with the erosion around a butterfly valve by means of a high-speed video camera, whose framing rate is 40500 per second. The velocity of...

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Bibliographic Details
Published inNihon Kikai Gakkai rombunshuu. B hen Vol. 60; no. 572; pp. 1133 - 1138
Main Authors Soyama, Hitoshi, Ohba, Kohtaro, Takeda, Sho, Ohba, Risaburo
Format Journal Article
LanguageJapanese
English
Published The Japan Society of Mechanical Engineers 1994
Subjects
Bubble
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Summary:In order to clarify the mechanism of the severe erosion mainly resulting from the singular vortex cavitation, we carefully observe the vortex cavitation associated with the erosion around a butterfly valve by means of a high-speed video camera, whose framing rate is 40500 per second. The velocity of cavitating flow is measured by the digital-image processing technique. It is worth noting that the vortex cavitation develops in the boundary region between the main flow region, i. e., the orifice-jet, and the recirculating region. The cavitating vortex core consists of several tiny vortex cavitations. The rotating velocity of the highly erosive vortex cavitation can also be determined by this technique.
ISSN:0387-5016
1884-8346
DOI:10.1299/kikaib.60.1133