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Influence of pressure on microbubble production rate in a confined turbulent jet


Giosio, DR and Pearce, BW and Brandner, PA, Influence of pressure on microbubble production rate in a confined turbulent jet, Proceedings of the 20th Australasian Fluid Mechanics Conference (20AFMC), 5-8 December 2016, Perth, Australia, pp. 1-4. (2016) [Refereed Conference Paper]

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The size spectra and production frequency of microbubbles generated within a confined turbulent jet from the expansion of supersaturated water are characterized by optical measurement. The generated microbubble plume is homogeneously dispersed into a uniform dilution flow before being discharged from a radial diffuser. Shadowgraphy measurements are made with a near range microscope on a 1 mm deep test volume at the outer radius of the diffuser eliminating depth of field limitations and allowing all detectable passing bubbles within the field of view to be imaged . The supersaturated water is expanded through a 0.5 mm diameter 0.3 mm thick orifice plate into a 1.2 mm diameter expansion tube. The effect of tube geometry is investigated on two devices of 100 mm and 200 mm in length. Saturation water pressures ranging from 400 kPa up to 1200 kPa were tested. For all operating conditions the dominant size bubble was found to be between 10 to 15 m while total production frequencies varied from 800 kHz up to 1183 kHz.

Item Details

Item Type:Refereed Conference Paper
Keywords:cavitation, microbubble generation, confined radial jet, rapid expansion
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:Giosio, DR (Dr Dean Giosio)
UTAS Author:Pearce, BW (Dr Bryce Pearce)
UTAS Author:Brandner, PA (Professor Paul Brandner)
ID Code:113929
Year Published:2016
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2017-01-30
Last Modified:2018-05-23
Downloads:182 View Download Statistics

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