Abstract
The bubble bursting process existing in the particle flow is a complex gas-liquid-solid three-phase coupling dynamic problem. The bubble bursting mechanism, including dynamic characteristics and wall effects, is not clear. To address the above matters, we present a modeling method for the piecewise linear interface calculation-volume of fluid (PLIC-VOF) based bubble burst. The bubble bursting process near or on the wall is analyzed to reveal the dynamic characteristics of bubble bursting and obtain the effect of a bubble bursting on the surrounding flow field. Then a particle image velocimetry (PIV) based self-developed experimental observation platform is established, and the effectiveness of the proposed method is verified. Research results indicate that, in the high-speed turbulent environment, a large pressure difference existed in the bubble tail, which induces the bubble burst to occur; the distance between the wall and the bubble decreases; the higher the flow velocity is, the less time is acquired for bubble bursting, but when the flow velocity exceeds the critical velocity 50 m/s, more time is needed; the coalescence-burst process of double bubbles increases the bubble bursting time, which causes the acceleration of particle motion to reduce.
Highlights
With the development of modern industries such as energy, petrochemical, pharmaceutical, aerospace, nuclear, and environmental engineering, three-phase flow-related theory research and technology development have been paid much attention to, and have become a complete basic application discipline [1,2,3]
Compared with burst near the wall, the micro-jet on the wall is closer to the wall and the jet intensity approaching the the wall,sothe on theon wall closer to theconducive wall and the jet intensity the single wall isbubble closer burst to thenear maximum, themicro-jet bubble burst theiswall is more to increase the approaching the wall is closer to the maximum, so the bubble burst on the wall is more conducive to kinetic energy of particles hitting the wall
The bubble bursting process involved in gas-liquid-solid three-phase particle flow is of great scientific and engineering value
Summary
With the development of modern industries such as energy, petrochemical, pharmaceutical, aerospace, nuclear, and environmental engineering, three-phase flow-related theory research and technology development have been paid much attention to, and have become a complete basic application discipline [1,2,3]. When the bubble bursting process can be effectively controlled, the surface processing efficiency can be increased It is of great scientific research value and engineering practical significance to research the dynamic characteristics and evolution mechanism of a bubble bursting in gas-liquid-solid three-phase particle flow and to reveal the law of particle motion and wall impact effect. The main scientific contribution of this paper is to provide a modeling method for bubble burst based on the PLIC-VOF interface-reconstruction method and reveal the evolution mechanism of the bubble bursting and wall effects under the turbulent condition.
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