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An experimental investigation of microbubble generation in confined turbulent jet


Brandner, PA and Wright, G and Pearce, B and Goldsworthy, L and Walker, GJ, An experimental investigation of microbubble generation in confined turbulent jet, Proceedings of the 17th Australasian Fluid Mechanics Conference, 5-9 December 2010, Auckland ISBN 978-0-86869-129-9 (2010) [Refereed Conference Paper]

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Copyright 2010 University of Auckland

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Microbubbles generated from the expansion of water supersaturated with dissolved air through a sharp edged orifice are investigated using shadowgraphy. Demineralised water saturated to an equilibrium concentration corresponding to 5 atmospheres is expanded through a 0.5 mm diameter x 0.3 mm thick orifice plate into a 1.2 mm diameter tube at atmospheric pressure. Cavitation occurrence in the small-scale turbulent structures combined with gaseous diffusion promotes the formation of microbubbles. The length affects bubble coalescence and hence the number and size of bubbles ejected. To enable measurements of bubble size and volumetric concentration the ejected bubble plume is dispersed in a co-flowing stream of fine-scale turbulence to achieve a homogeneous distribution in a transparent duct though which shadowgraphy measurements can be made. The buble shadows are created using diffused laser backlighting viewed with a CCD camera via a long range microscope.

Item Details

Item Type:Refereed Conference Paper
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Maritime engineering not elsewhere classified
Objective Division:Defence
Objective Group:Defence
Objective Field:Maritime
UTAS Author:Brandner, PA (Professor Paul Brandner)
UTAS Author:Pearce, B (Dr Bryce Pearce)
UTAS Author:Goldsworthy, L (Dr Laurie Goldsworthy)
UTAS Author:Walker, GJ (Professor Greg Walker)
ID Code:67312
Year Published:2010
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2011-03-02
Last Modified:2015-10-01
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