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

Hitoshi Soyama; Kohtaro OH Ba; Sho Takeda; Risaburo Ohba

doi:10.1299/kikaib.60.1133

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

Hitoshi Soyama, Kohtaro OH Ba, Sho Takeda, Risaburo Ohba

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	1133-1138
Number of pages	6
Journal	Transactions of the Japan Society of Mechanical Engineers Series B
Volume	60
Issue number	572
DOIs	https://doi.org/10.1299/kikaib.60.1133
Publication status	Published - 1994 Jan 1
Externally published	Yes

Keywords

Bubble
Cavitation
Digital Image Processing
Erosion
Flow Measurements
Un-steady Flow
Valve
Vortex

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering

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10.1299/kikaib.60.1133

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title = "High-Speed Observations of Highly Erosive Vortex Cavitation around Butterfly Valve",

abstract = "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.",

keywords = "Bubble, Cavitation, Digital Image Processing, Erosion, Flow Measurements, Un-steady Flow, Valve, Vortex",

author = "Hitoshi Soyama and Ba, {Kohtaro OH} and Sho Takeda and Risaburo Ohba",

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AU - Ohba, Risaburo

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