University Of Tasmania

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Microbubble production in a confined cavitating radial jet

conference contribution
posted on 2023-05-23, 15:05 authored by Luka BarbacaLuka Barbaca, Paul, RA, Bryce PearceBryce Pearce, Paul BrandnerPaul Brandner
Microbubble populations generated via rapid depressurization of supersaturated water in a confined radial jet are characterized using shadowgraphy measurements. An experimental apparatus has been utilized enabling independent control of the two main parameters controlling the flow: cavitation number (𝜎inj) and Reynolds number (Re). Saturated water was supplied at pressures between 200 and 1600 kPa, and outlet pressures were varied between 10 and 300 kPa, resulting in 𝜎inj range 0.05 < 𝜎inj < 0.6 and 𝑅e range 10000 < Re < 25000. Microbubbles form through turbulent break-up and gaseous diffusion in the cavity closure region. Generated populations have a ploy-disperse size distribution with a dominant bubble size of about 5-10 μm with the majority of bubbles smaller than 20 μm. Total production frequencies of up to 50 MHz are observed. The influence of Re on generated microbubble populations is found to be more pronounced than that of 𝜎inj


Defence Science and Technology Group


Publication title

Proceedings of the 11th International Symposium on Cavitation (CAV2021)






Australian Maritime College


11th International Symposium on Cavitation

Place of publication

Korea Republic of

Event title

CAV2021: 11th International Symposium on Cavitation

Event Venue

Daejon, Korea (Virtual Conference)

Date of Event (Start Date)


Date of Event (End Date)


Rights statement

Copyright unknown

Repository Status

  • Restricted

Socio-economic Objectives

Emerging defence technologies; Maritime; Expanding knowledge in engineering