An experimental study on the characteristics of ejector-generated bubble swarms

Aliyu M. Aliyu, Hyunduk Seo, Minkyun Kim, Kyung Chun Kim

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Abstract: In this study, we report an experimental investigation into the bubble generation characteristics of a venturi-type ejector. A 5-mm-diameter vertically upwards nozzle placed in a 1-m 3 water tank was used to generate bubbles at between 2 and 20 L/min airflow rate corresponding to a Reynolds number range of 1.7–17 × 10 3 . High-speed photography and image analysis were used for bubble visualisation and feature extraction. An image processing algorithm was used to obtain bubble velocity profiles and size distribution. It was established that when the nozzle was placed at the ejector’s neck, high bubble velocities result, especially at large Reynolds numbers. Bubble size distributions were created, and size variability is strongly correlated with the gas Reynolds number as well as other liquid properties describing gas flow encountering a quiescent bulk liquid. Graphical Abstract: [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)711-728
Number of pages18
JournalJournal of Visualization
Issue number5
Early online date21 May 2018
Publication statusPublished - 1 Oct 2018
Externally publishedYes


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