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Experiments in Fluids

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01.06.2015 | Research Article

Optical measurements of gas bubbles in oil behind a cavitating micro-orifice flow

verfasst von: Uwe Iben, Fabian Wolf, Hans-Arndt Freudigmann, Jochen Fröhlich, Winfried Heller

Erschienen in: Experiments in Fluids | Ausgabe 6/2015

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Abstract

In hydraulic systems, it is common for air release to occur behind valves or throttles in the form of bubbles. These air bubbles can affect the behavior and the performance of these systems to a substantial extent. In the paper, gas release in a liquid flow behind an orifice is analyzed by optical methods for various operation points. The bubbles are observed with a digital camera, and a detection algorithm based on the Hough transformation is used to determine their number and size. The appearance of gas bubbles is very sensitive to the inlet and outlet pressure of the orifice. Gas bubbles are only observed if choking cavitation occurs. An empirical relationship between an adjusted cavitation number and the appearance of gas release is presented. It is assumed that the observed bubbles contain mostly air. With the applied pressure differences, up to 30 % of the dissolved air was degassed in the form of bubbles.

Vorheriger Artikel High-resolution PIV measurements of a transitional shock wave–boundary layer interaction

Nächster Artikel Toluene-based planar laser-induced fluorescence imaging of temperature in hypersonic flows

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Titel: Optical measurements of gas bubbles in oil behind a cavitating micro-orifice flow
verfasst von: Uwe Iben
Fabian Wolf
Hans-Arndt Freudigmann
Jochen Fröhlich
Winfried Heller
Publikationsdatum: 01.06.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: Experiments in Fluids / Ausgabe 6/2015
Print ISSN: 0723-4864
Elektronische ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-015-1979-6

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