Abstract
The shape and rising behavior of the horizontally arranged twin bubbles in a steady liquid are experimentally studied employing high-speed photography and digital image processing, and numerically studied by the Volume-Of-Fluid (VOF) method, in combination with a momentum equation coupled with a surface tension model. The movement trajectory and the velocity variation in horizontal and vertical directions of the horizontally arranged twin bubbles rising side by side, as observed in experiments, are described. According to the results, when two bubbles rise side by side, their horizontal velocity changes by the simple harmonic law; there is a cyclical process of two bubbles repeatedly attracted to and bounced against each other, rather than at constant distance between each other, and the bubbles swing up and down periodically in the water. The mathematical model and its numerical implementation are presented in detail. The validation of the model is confirmed by comparing the numerical and experimental results, which are in good agreement with each other; the numerical simulation can accurately reproduce the deformation, attraction, and repulsion of the bubble pairs. The phenomenon of attraction and repulsion is comprehensively analyzed from the viewpoint of a flow field. It is considered that the interaction between the bubbles is mainly influenced by the changes of the flow field due to vortex counteraction and wake merging effects.
Highlights
The gas–liquid two-phase flow phenomenon exists widely in the chemical, petroleum, nuclear power, and new energy industries, such as solar energy and biogas energy, and many other fields [1,2,3,4].It is important to gain a more fundamental understanding of the interaction mechanism between the bubble and its surrounding flow field in two-phase flow
Bubble dynamics has been recognized as an important topic, and many investigators focus on the study of bubble dynamics [5,6,7,8,9]
Whentwo two bubbles bubbles move move together, together, Bubbles interaction is produced only when the bubble is located in the influence range of another bubble, interaction is produced only when the bubble is located in the influence range of another bubble, causing the the change change of of the the surrounding surrounding flow flow field field structure
Summary
The gas–liquid two-phase flow phenomenon exists widely in the chemical, petroleum, nuclear power, and new energy industries, such as solar energy and biogas energy, and many other fields [1,2,3,4]. It is important to gain a more fundamental understanding of the interaction mechanism between the bubble and its surrounding flow field in two-phase flow. Bubble dynamics has been recognized as an important topic, and many investigators focus on the study of bubble dynamics [5,6,7,8,9]. Chao [10] studied the collapse of a spherical bubble when it was in transitory motion. Studied single bubble behavior characteristics and the flow field distribution in gas–liquid two-phase flow. Zhu et al [12] discussed bubble formation, motion, and the evolution of the bubbling features, including bubble size, shape, and velocity
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
