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Abstract

Microbubble populations generated via expansion of supersaturated water through an orifice into an expansion tube, in a socalled mini-tube type device, are characterized using shadowgraphy measurements. The effect of geometric scale is investigated by testing geometrically similar devices with the orifice diameters of 0.25 and 0.5 mm. To allow the detection of all bubbles passing through the imaged field-of-view, bubbly plume was discharged into a 0.5 mm thick Hele-Shaw cell, thus eliminating the need for depth-of-field correction. Saturation water was supplied at pressures between 200 and 1600 kPa. Both devices generated a poly-disperse bubble population, with dominant bubble size of about 10 µm. Halving the orifice diameter resulted with approximately an order of magnitude lower bubble production rate for the same supersaturated water supply pressure.

Item Type:	Conference Publication
Authors/Creators:	Barbaca, L and Russell, PS and Pearce, BW and Brandner, PA
Keywords:	microbubble, nuclei, cavitation, mini-tube
Journal or Publication Title:	Proceedings of the 22nd Australasian Fluid Mechanics Conference AFMC2020
Publisher:	University of Queensland
DOI / ID Number:	10.14264/36f5f4c
Copyright Information:	Creative Commons Attribution-NonCommercial 3.0 International (CC BY-NC 3.0)
Related URLs:	Google Scholar: Barbaca, L Google Scholar: Pearce, BW UTAS Profile: Pearce, BW Google Scholar: Brandner, PA UTAS Profile: Brandner, PA
Item Statistics:	View statistics for this item

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