In situ measurements of void fractions and bubble size distributions in bubble curtains

Simon Beelen*, Martijn van Rijsbergen, Miloš Birvalski, Fedde Bloemhof, Dominik Krug*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
36 Downloads (Pure)


We report the development of a novel measurement system designed to measure bubble properties in bubble curtains (i.e. planar bubble plumes) in situ alongside acoustical measurements. Our approach is based on electrical, contact-based needle sensors in combination with an optical system. The latter is used for calibration and validation purposes. Correcting for the insensitive distance of the needle tips yields very good agreement between the two approaches in terms of the local void fraction and bubble size distributions. Finally, the system is employed to study bubble plumes evolving from three different hose types. All hoses display consistent self-similar behaviour with spreading rates increasing with increasing gas flow. The spreading is further found to be significantly higher when the bubble plumes originated from a porous hose compared to the two other hose types featuring either discrete holes or nozzle elements.

Original languageEnglish
Article number31
JournalExperiments in fluids
Issue number2
Early online date24 Jan 2023
Publication statusPublished - Feb 2023


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