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research-article

Air bubble entrainment, breakup and Interplay in vertical plunging jets

[+] Author and Article Information
Numa J. Bertola

School of Civil Engineering, The University of Queensland, Brisbane QLD 4072, Australia, ETH-Zürich, Future Cities Laboratory, Singapore
numa.bertola@epfl.ch

Hang Wang

School of Civil Engineering, The University of Queensland, Brisbane QLD 4072, Australia
hang.wang@uqconnect.edu.au

Hubert Chanson

School of Civil Engineering, The University of Queensland, Brisbane QLD 4072, Australia
h.chanson@uq.edu.au

1Corresponding author.

ASME doi:10.1115/1.4039715 History: Received October 02, 2017; Revised March 16, 2018

Abstract

The entrainment, breakup and interplay of air bubbles were observed in a vertical, two-dimensional supported jet at low impact velocities. Ultra-high-speed movies were analyzed both qualitatively and quantitatively. The onset velocity of bubble entrainment was between 0.9 and 1.1 m/s. Most bubbles were entrained as detached bubbles from elongated air cavities at the impingement point. Explosion, stretching and dejection mechanisms were observed for individual bubble breakup, and the bubble interaction behaviors encompassed bubble rebound, "kiss-and-go", coalescence and breakup induced by approaching bubble(s). The effects of jet impact velocity on the bubble behaviors were investigated for impact velocities from 1.0 to 1.36 m/s, in the presence of a shear flow environment.

Copyright (c) 2018 by ASME
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