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

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

doi:10.1007/s12650-018-0494-2

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 journal › Article › peer-review

7 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 language	English
Pages (from-to)	711-728
Number of pages	18
Journal	Journal of Visualization
Volume	21
Issue number	5
Early online date	21 May 2018
DOIs	https://doi.org/10.1007/s12650-018-0494-2
Publication status	Published - 1 Oct 2018
Externally published	Yes

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Cite this

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title = "An experimental study on the characteristics of ejector-generated bubble swarms",

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{\textquoteright}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.]. ",

keywords = "Cross-correlation, Ejector, Image processing, Sauter mean diameter, Velocity profile",

author = "Aliyu, {Aliyu M.} and Hyunduk Seo and Minkyun Kim and Kim, {Kyung Chun}",

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T1 - An experimental study on the characteristics of ejector-generated bubble swarms

AU - Aliyu, Aliyu M.

AU - Seo, Hyunduk

AU - Kim, Minkyun

AU - Kim, Kyung Chun

PY - 2018/10/1

Y1 - 2018/10/1

N2 - 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.].

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.].

KW - Cross-correlation

KW - Ejector

KW - Image processing

KW - Sauter mean diameter

KW - Velocity profile

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JO - Journal of Visualization

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

Abstract

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