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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 10–15 μm, with a total production frequency of 1454 kHz.

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 Hydrodynamics
Objective Division:	Manufacturing
Objective Group:	Transport Equipment
Objective Field:	Nautical Equipment (excl. Yachts)
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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