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Volume oscillations slow down a rising Taylor bubble

Published online by Cambridge University Press:  04 January 2024

Guangzhao Zhou Open the ORCID record for Guangzhao Zhou [Opens in a new window]  and
Andrea Prosperetti Open the ORCID record for Andrea Prosperetti [Opens in a new window]
Guangzhao Zhou*
Affiliation:
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, PR China
Andrea Prosperetti*
Affiliation:
Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
*
†Email addresses for correspondence: zgz@ucas.ac.cn, aprosper@central.uh.edu
†Email addresses for correspondence: zgz@ucas.ac.cn, aprosper@central.uh.edu
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Abstract

A gas volume rising in a vertical tube is called a Taylor bubble when its equivalent spherical diameter is greater than the diameter of the tube. Continuity dictates that the rising velocity of such bullet-shaped bubbles must be such that the drainage flow in the liquid film separating the gas from the tube wall equals the rate at which space is vacated by the bubble tail on its rise. The numerical simulations presented here show that, if the volume of the bubble is made to execute small-amplitude oscillations, this drainage flow can be markedly decreased so that the bubble slows down so much as to very nearly stop. The mechanism is a subtle nonlinear interplay between the upward flow imposed by the bubble expansion and the inertia of the falling liquid. Two manners of excitation are considered. In the first one the liquid column above the bubble is forced to oscillate sinusoidally, e.g. by a piston. In the second one, an oscillating pressure is imposed on the top liquid surface. With the first arrangement the bubble slows down during its entire ascent by an amount depending on the oscillation frequency and amplitude. With the second one, for a given frequency, the bubble slows down only in the neighbourhood of a certain resonant depth at which the volume oscillations are maximized, but is little affected at deeper and shallower depths.

JFM classification

Multiphase and Particle-laden Flows: Gas/liquid flow Drops and Bubbles: Bubble dynamics Multiphase and Particle-laden Flows: Core-annular flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 978 , 10 January 2024 , A13
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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