Flow Structure and Deformation of Two Bubbles Rising Side by Side in a Quiescent Liquid

In the motion of two spherical bubbles rising side by side, the bubbles are known to attract each other at a high Reynolds number (Re = ρUd/μ). Furthermore, spherical bubbles kiss and bounce under certain conditions; however, deformable bubble...

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Autores principales:	Hiroaki Kusuno, Toshiyuki Sanada
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	bubble bubble–bubble interaction bubble shape bubble motion Thermodynamics QC310.15-319 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/9d988921dfd44245871bb08d651e2756
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spelling	oai:doaj.org-article:9d988921dfd44245871bb08d651e27562021-11-25T17:31:34ZFlow Structure and Deformation of Two Bubbles Rising Side by Side in a Quiescent Liquid10.3390/fluids61103902311-5521https://doaj.org/article/9d988921dfd44245871bb08d651e27562021-11-01T00:00:00Zhttps://www.mdpi.com/2311-5521/6/11/390https://doaj.org/toc/2311-5521In the motion of two spherical bubbles rising side by side, the bubbles are known to attract each other at a high Reynolds number (<i>Re</i> = <i>ρUd</i>/<i>μ</i>). Furthermore, spherical bubbles kiss and bounce under certain conditions; however, deformable bubbles repel each other without kissing. This paper experimentally and numerically presents the flow structures and shape of the nonkissing repulsion of deformable bubbles. For the experimental analysis, we organized bubble behaviors by Galilei number (<i>Ga</i> = <i>ρg</i><sup>1/2</sup><i>d</i><sup>3/2</sup>/<i>μ</i>) and Bond number (<i>Bo</i> = <i>ρgd</i><sup>2</sup>/<i>σ</i>). The bubbles repelled each other without kissing near the unstable critical curve of a single bubble. The curvature inside the gap, which is similar to the shape of a zigzag behavior bubble, was large. For the numerical analysis, the velocity of the equatorial plane inside the gap was larger due to the potential interaction, although the velocity behind was the opposite due to the strengthened vorticity generated at the surface. Furthermore, the double-threaded wake emerged behind the interacting bubbles, and it showed that the rotation direction was repulsion regardless of whether the bubbles attracted or repelled each other. The streamline behind the bubbles in the 2D plane was from the outside to the inside.Hiroaki KusunoToshiyuki SanadaMDPI AGarticlebubblebubble–bubble interactionbubble shapebubble motionThermodynamicsQC310.15-319Descriptive and experimental mechanicsQC120-168.85ENFluids, Vol 6, Iss 390, p 390 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bubble bubble–bubble interaction bubble shape bubble motion Thermodynamics QC310.15-319 Descriptive and experimental mechanics QC120-168.85
spellingShingle	bubble bubble–bubble interaction bubble shape bubble motion Thermodynamics QC310.15-319 Descriptive and experimental mechanics QC120-168.85 Hiroaki Kusuno Toshiyuki Sanada Flow Structure and Deformation of Two Bubbles Rising Side by Side in a Quiescent Liquid
description	In the motion of two spherical bubbles rising side by side, the bubbles are known to attract each other at a high Reynolds number (<i>Re</i> = <i>ρUd</i>/<i>μ</i>). Furthermore, spherical bubbles kiss and bounce under certain conditions; however, deformable bubbles repel each other without kissing. This paper experimentally and numerically presents the flow structures and shape of the nonkissing repulsion of deformable bubbles. For the experimental analysis, we organized bubble behaviors by Galilei number (<i>Ga</i> = <i>ρg</i><sup>1/2</sup><i>d</i><sup>3/2</sup>/<i>μ</i>) and Bond number (<i>Bo</i> = <i>ρgd</i><sup>2</sup>/<i>σ</i>). The bubbles repelled each other without kissing near the unstable critical curve of a single bubble. The curvature inside the gap, which is similar to the shape of a zigzag behavior bubble, was large. For the numerical analysis, the velocity of the equatorial plane inside the gap was larger due to the potential interaction, although the velocity behind was the opposite due to the strengthened vorticity generated at the surface. Furthermore, the double-threaded wake emerged behind the interacting bubbles, and it showed that the rotation direction was repulsion regardless of whether the bubbles attracted or repelled each other. The streamline behind the bubbles in the 2D plane was from the outside to the inside.
format	article
author	Hiroaki Kusuno Toshiyuki Sanada
author_facet	Hiroaki Kusuno Toshiyuki Sanada
author_sort	Hiroaki Kusuno
title	Flow Structure and Deformation of Two Bubbles Rising Side by Side in a Quiescent Liquid
title_short	Flow Structure and Deformation of Two Bubbles Rising Side by Side in a Quiescent Liquid
title_full	Flow Structure and Deformation of Two Bubbles Rising Side by Side in a Quiescent Liquid
title_fullStr	Flow Structure and Deformation of Two Bubbles Rising Side by Side in a Quiescent Liquid
title_full_unstemmed	Flow Structure and Deformation of Two Bubbles Rising Side by Side in a Quiescent Liquid
title_sort	flow structure and deformation of two bubbles rising side by side in a quiescent liquid
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9d988921dfd44245871bb08d651e2756
work_keys_str_mv	AT hiroakikusuno flowstructureanddeformationoftwobubblesrisingsidebysideinaquiescentliquid AT toshiyukisanada flowstructureanddeformationoftwobubblesrisingsidebysideinaquiescentliquid
_version_	1718412241831723008

Flow Structure and Deformation of Two Bubbles Rising Side by Side in a Quiescent Liquid

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