Abstract
The pulsation of cavitation bubbles under constraint conditions has complex dynamic characteristics and has been widely applied in various fields, such as liquid pumping, underwater propulsion, and clinical applications. In this study, the dynamic behaviors of a laser-induced bubble in a tube are investigated under different initial conditions. A high-speed optical visualization is carried out in the experiments. The numerical simulation based on the volume-of-fluid method is implemented on the open source code OpenFOAM. From the experimental observation and numerical analysis, an axial jet pointing toward the front end of the tube is generated during bubble shrinkage. According to the type of the axial jet, the collapse patterns are classified into three regimes: one-dimensional, transitional, and three-dimensional. Furthermore, it is also found that the normalized initial energy of the bubble and the length-to-diameter ratio affect the maximum length and the pulsation period of the bubble. Finally, the transition mechanism of the collapse patterns from one dimension to three dimension is obtained through a phase diagram by combining experimental observations with numerical simulation.
Highlights
The phenomenon of cavitation has been observed in the fields of industrial cleaning,[1,2] biomedical engineering,[3,4] chemical reactions,[5,6] marine engineering,[7,8] and other applications.[9,10] Its dynamic behaviors have been studied in detail experimentally, theoretically, and numerically
A high-speed optical visualization was carried out to observe the physical processes of the bubble under different initial conditions
The numerical simulation based on the VOF method was implemented on the open source code OpenFOAM
Summary
The phenomenon of cavitation has been observed in the fields of industrial cleaning,[1,2] biomedical engineering,[3,4] chemical reactions,[5,6] marine engineering,[7,8] and other applications.[9,10] Its dynamic behaviors have been studied in detail experimentally, theoretically, and numerically. A cavitation bubble can remain spherical during volume oscillation. The pulsation of cavitation bubbles has more complex dynamic characteristics, which appear more frequently in the practical application.[11–13]. The rigid wall created asymmetry in the flow field and forced the bubble to collapse non-spherically, so that a jet pointing from high pressure to low pressure was generated and penetrated the opposite edge of the bubble. With the development of high-speed photography, the dynamic behaviors of cavitation have been deeply studied under the constraint conditions of a solid wall,[15–17] an elastic boundary,[18–20] a free surface,[21–23] and body force.[24,25]. Supponen et al.[26] classified the jets into three distinct regimes: weak, intermediate, and strong, combining theoretical considerations with hundreds of high-speed visualizations of bubbles collapsing near different kinds of boundaries With the development of high-speed photography, the dynamic behaviors of cavitation have been deeply studied under the constraint conditions of a solid wall,[15–17] an elastic boundary,[18–20] a free surface,[21–23] and body force.[24,25] Supponen et al.[26] classified the jets into three distinct regimes: weak, intermediate, and strong, combining theoretical considerations with hundreds of high-speed visualizations of bubbles collapsing near different kinds of boundaries
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.
