Hydrodynamics features of dispersed bubbles in the ventilated wake flow of a cylinder

Ning Mao; Can Kang; Wisdom Opare; Yang Zhu

doi:10.1016/j.cjche.2018.04.002

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Hydrodynamics features of dispersed bubbles in the ventilated wake flow of a cylinder

Fluid Dynamics and Transport Phenomena | Updated：2026-01-06

- Hydrodynamics features of dispersed bubbles in the ventilated wake flow of a cylinder
- Chinese Journal of Chemical Engineering Vol. 26, Issue 9, Pages: 1803-1813(2018)
- Affiliations：
  
  2 Faculty of Engineering, Takoradi Technical University, Takoradi,. O. Box,P,Ghana,256
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2018.04.002
  CLC：
- Published：2018
- Accepted：
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Ning Mao, Can Kang, Wisdom Opare, Yang Zhu. Hydrodynamics features of dispersed bubbles in the ventilated wake flow of a cylinder[J]. Chin.J.Chem.Eng., 2018, 26(9): 1803-1813.
DOI：

Ning Mao, Can Kang, Wisdom Opare, Yang Zhu. Hydrodynamics features of dispersed bubbles in the ventilated wake flow of a cylinder[J]. Chin.J.Chem.Eng., 2018, 26(9): 1803-1813. DOI： 10.1016/j.cjche.2018.04.002.

摘要

Abstract

An experimental study was conducted to investigate the 2D bubbly flow downstream of a cylinder. Sparsely distributed bubbles were produced using the ventilation method. The carrier flow was measured using the particle image velocimetry (PIV) technique. The shadow imaging technique was used to capture instantaneous bubbly flow images. An image-processing code was compiled to identify bubbles in acquired image

calculate the bubble equivalent diameter and the bubble velocity. The effects of Reynolds number and the flow rate of the injected air were considered. The result indicates that the carrier flow is featured by distinct flow structures and the wake region is suppressed as the upstream velocity increases. Regarding the bubbles trapped in the wake flow

the number of small bubbles increases with the upstream velocity. On the whole

the bubble velocity is slightly lower than that of the carrier flow. The consistency between small bubbles and the carrier flow is high in terms of velocity magnitude

which is justified near the wake edge. The difference between the bubble velocity and the carrier flow velocity is remarkable near the wake centerline. For certain Reynolds number

with the increase in the air flow rate

the bubble equivalent diameter increases and the bubble void fraction is elevated.

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