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An experimental investigation of microbubble generation in confined turbulent jet

conference contribution
posted on 2023-05-23, 05:08 authored by Paul BrandnerPaul Brandner, Wright, G, Bryce PearceBryce Pearce, Goldsworthy, L, Walker, GJ
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.

History

Publication title

Proceedings of the 17th Australasian Fluid Mechanics Conference

Editors

GD Mallinson and JE Cater

ISBN

978-0-86869-129-9

Department/School

Australian Maritime College

Publisher

Australian Fluid Mechanics Society

Place of publication

Australia

Event title

17th Australasian Fluid Mechanics Conference

Event Venue

Auckland

Date of Event (Start Date)

2010-12-05

Date of Event (End Date)

2010-12-09

Rights statement

Copyright 2010 University of Auckland

Repository Status

  • Restricted

Socio-economic Objectives

Maritime

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