Modeling of bubble breakup and coalescence rates in sudden expansions and contractions

2018 ◽  
Author(s):  
Cristian Rosero ◽  
E. do A. Soares
Keyword(s):  
Bubble Breakup

Theoretical model for drop and bubble breakup in turbulent dispersions

AIChE Journal ◽  
1996 ◽  
Vol 42 (5) ◽  
pp. 1225-1233 ◽  
Author(s):  
Hean Luo ◽  
Hallvard F. Svendsen
Keyword(s):  
Theoretical Model ◽  
Bubble Breakup ◽  
Turbulent Dispersions

Bubble Breakup Phenomena in a Venturi Tube

2007 ◽  
Author(s):  
A. Fujiwara ◽  
K. Okamoto ◽  
K. Hashiguchi ◽  
J. Peixinho ◽  
S. Takagi ◽  
...  
Keyword(s):  
High Speed ◽  
Bubbly Flow ◽  
Bubble Diameter ◽  
Pressure Change ◽  
Venturi Tube ◽  
Large Bubble ◽  
Breakup Process ◽  
Bubble Behavior ◽  
Bubble Breakup ◽  
Unstable Surface

Microbubble generation techniques have been proposed in former investigations. Here, we study an effective technique using air bubbly flow into a convergent-divergent nozzle (venturi tube). Pressure change in the diverging section induces bubble breakup. The purpose of this study is to clarify the effect of flow velocity at the throat with respect to the bubble breakup process and the bubble behavior in a venturi tube. Relations between generated bubble diameter and bubble breakup process are also described. Using high speed camera for detailed observation of bubble behavior, the following features were obtained. The velocity at the throat is expected to be of the order of the magnitude of the speed of sound of bubbly flow and a drastic bubble expansion and a shrink is induced. Besides, a liquid column appeared after the bubble flowing into the throat, and it grew up to stick to the bubble like in the form of a jet. This jet induced both unstable surface waves and the breakup of a single large bubble into several pieces.

Air Bubble Entrainment, Breakup, and Interplay in Vertical Plunging Jets

2018 ◽  
Vol 140 (9) ◽  
Author(s):  
Numa Bertola ◽  
Hang Wang ◽  
Hubert Chanson
Keyword(s):  
High Speed ◽  
Point Explosion ◽  
Air Bubble ◽  
Bubble Breakup ◽  
Jet Impact ◽  
Bubble Entrainment ◽  
Bubble Interaction ◽  
Onset Velocity ◽  
Air Cavities ◽  
Interaction Behaviors

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.

scholarly journals A model for drop and bubble breakup frequency based on turbulence spectra

AIChE Journal ◽  
2018 ◽  
Vol 65 (1) ◽  
pp. 347-359 ◽  
Author(s):  
Benjamin Lalanne ◽  
Olivier Masbernat ◽  
Frédéric Risso
Keyword(s):  
Turbulence Spectra ◽  
Bubble Breakup

An improved bubble breakup model in turbulent flow

2020 ◽  
Vol 386 ◽  
pp. 121484 ◽  
Author(s):  
Huahai Zhang ◽  
Guangyao Yang ◽  
Ali Sayyar ◽  
Tiefeng Wang
Keyword(s):  
Turbulent Flow ◽  
Bubble Breakup ◽  
Breakup Model

A visualized study of bubble breakup in small rectangular Venturi channels

2019 ◽  
Vol 1 (3) ◽  
pp. 177-185 ◽  
Author(s):  
Jiang Huang ◽  
Licheng Sun ◽  
Zhengyu Mo ◽  
Hongtao Liu ◽  
Min Du ◽  
...  
Keyword(s):  
Bubble Breakup ◽  
Visualized Study

Bubble breakup in a swirl-venturi microbubble generator

2021 ◽  
Vol 403 ◽  
pp. 126397 ◽  
Author(s):  
Xinyan Wang ◽  
Yun Shuai ◽  
Haomiao Zhang ◽  
Jingyuan Sun ◽  
Yao Yang ◽  
...  
Keyword(s):  
Bubble Breakup
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