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 journalArticle

2 Citations (Scopus)

Abstract

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
Volume21
Issue number5
Early online date21 May 2018
DOIs
Publication statusPublished - 1 Oct 2018
Externally publishedYes

Fingerprint

ejectors
Reynolds number
bubbles
Nozzles
High speed photography
Water tanks
Liquids
Velocity distribution
Image analysis
nozzles
Flow of gases
Feature extraction
Image processing
Visualization
high speed photography
liquids
image analysis
Gases
pattern recognition
gas flow

Cite this

Aliyu, Aliyu M. ; Seo, Hyunduk ; Kim, Minkyun ; Kim, Kyung Chun. / An experimental study on the characteristics of ejector-generated bubble swarms. In: Journal of Visualization. 2018 ; Vol. 21, No. 5. pp. 711-728.
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An experimental study on the characteristics of ejector-generated bubble swarms. / Aliyu, Aliyu M.; Seo, Hyunduk; Kim, Minkyun; Kim, Kyung Chun.

In: Journal of Visualization, Vol. 21, No. 5, 01.10.2018, p. 711-728.

Research output: Contribution to journalArticle

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AU - Aliyu, Aliyu M.

AU - Seo, Hyunduk

AU - Kim, Minkyun

AU - Kim, Kyung Chun

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AB - 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.].

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