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\begin{document}

\title{A visualized investigation of bubble breakup in a swirl-venturi bubble
generator}



\author[1]{Haiyan Bie}%
\author[2]{Yunxia Li}%
\author[2]{licheng Xue}%
\author[3]{Yue Wang}%
\author[3]{Gang Liu}%
\author[3]{Zongrui Hao}%
\author[2]{weizhong An}%
\affil[1]{Ocean University of China}%
\affil[2]{Ocean University of China - Laoshan Campus}%
\affil[3]{Qilu University of Technology (Shandong Academy of Sciences)}%


\vspace{-1em}



  
  \date{June 16, 2024}


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\begin{abstract}
The dynamics and breakup of bubbles in swirl-venturi bubble generator
(SVBG) are explored in this work. The three-dimensional movement process
and breakup phenomena of bubbles are captured by one high-speed camera
system with two cameras while the distribution of swirling flow field
are recorded through Particle Image Velocimetry technology. It is
revealed that bubbles have two motion trajectories, which are deeply
related to bubble breakup. One trajectory is that mother bubble moves
upward in an axial direction of the SVBG to the diverging section, and
the other trajectory is that mother bubble rotates obliquely upward to
another side-wall along the radial direction. Meanwhile, binary breakup,
shear-off-induced breakup, static erosive breakup and dynamic erosive
breakup are observed. For relatively high liquid Reynolds number, vortex
flow regions are extended and the bubble size is reduced. Furthermore,
it is worth noting that the number of microbubbles increases
significantly for intensive swirling flow.%
\end{abstract}%



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