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An experimental investigation of the optical measurement of microbubbles in a confined radial jet


Trump, MC and De Graaf, KL and Pearce, BW and Brandner, PA, An experimental investigation of the optical measurement of microbubbles in a confined radial jet, Proceedings of the 7th Australian Conference on Laser Diagnostics in Fluid Mechanics and Combustion, 9-11 December 2015, Melbourne, Australia, pp. 29-34. ISBN 978-0-646-94892-8 (2015) [Refereed Conference Paper]

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An experimental shadowgraphy setup and procedure has been designed to investigate microbubble size distribution and production frequency of a mini-tube type microbubble generator as implemented in the Australian Maritime College Cavitation Research Laboratory. To overcome the depth-of-field limitations of traditional shadowgraphy setups, the present study uses a radial diffuser to reduce the depth of the test volume to 1 mm, allowing all bubbles to be imaged within the acceptable plane of focus. Shadowgraphy measurements are made of a microbubble plume, injected into a uniform, low-turbulence dilution flow to homogeneously disperse the microbubbles. Bubble shadows are created with stroboscopic lighting and recorded with a highresolution digital camera and close-range microscope. Results show that the dominant size interval for the microbubble generator used in the current study is 1015 μm, with a total production frequency of 1454 kHz.

Item Details

Item Type:Refereed Conference Paper
Keywords:micro-bubble size measurement, shadowgraphy, near field microscopy
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ship and platform structures (incl. maritime hydrodynamics)
Objective Division:Manufacturing
Objective Group:Transport equipment
Objective Field:Nautical equipment
UTAS Author:Trump, MC (Mr Matthew Trump)
UTAS Author:De Graaf, KL (Dr Katrina De Graaf)
UTAS Author:Pearce, BW (Dr Bryce Pearce)
UTAS Author:Brandner, PA (Professor Paul Brandner)
ID Code:106498
Year Published:2015
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2016-02-11
Last Modified:2018-04-05

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