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Numerical investigations of the interactions between bubble induced shock waves and particle based on OpenFOAM

Journal of Hydrodynamics 2024年第2期36卷 355-362页

作者： Jia-xin Yu Jin-sen Hu Yu-hang Liu Yi-fan Liu Dan Gao Yu-ning Zhang Key Laboratory of Power Station Energy Transfer Conversion and System Ministry of EducationSchool of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China

The presence of particles and the shock waves generated by the cavitation bubbles can significantly affect the safety and the performance of hydrodynamic *** the present paper,the shock waves generated by cavitation bubble collapsing near the particle are numerically investigated based on the OpenFOAM together with the numerical schlieren for the shock wave *** numerical results reveal that the stand-off distance is one of the paramount factors affecting the interactions between the particle and the shock *** different kinds of shock waves(e.g.,bubble-inception,jet formation,particle reflected and jet-split shock waves)are observed during the bubble collapsing near the *** stand-off distance smaller than 0.5 or larger than 1.1,the maximum pressure at particle surface generated by the bubble growth can surpass those of the collapse stage.

关键词： particle-bubble interaction shockwaves jetdynamics

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Experimental research of the cavitation bubble dynamics during the second oscillation period near a spherical particle

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Journal of Hydrodynamics 2023年第4期35卷 700-711页

作者： Xiao-yu Wang Hong-chen Su Shao-wei Li Guan-hao Wu Xiao-xiao Zheng Ya-xin Duan Yu-ning Zhang Key Laboratory of Power Station Energy Transfer Conversion and System(Ministry of Education) School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou310027China

In this paper,the dynamic behaviors of the cavitation bubble near a fixed spherical particle during the second oscillation period are analyzed based on the high-speed photographic *** deformation and motion of the bubble during the second period are investigated by changing the distance between the particle and the bubble and the maximum radius of the ***,the variation of the equivalent radius and the centroid motions are analyzed,and the dynamic behaviors of the bubble are categorized according to the bubble morphological characteristics during the second *** this research,it is found that(1)The dynamic behaviors of the bubble during the second oscillation period could be divided into three typical cases:For case 1,a bulge would exist on the bubble interface away from the particle,and for case 2,a bulge would appear on the bubble interface and evolve towards the particle,while for case 3,the bubble would be divided into two parts.(2)The larger the dimensionless distance between the particle and the bubble,the smaller the maximum bubble equivalent radius in the second period,and the shorter the second oscillation period.(3)When the bubble is close to the particle,a counter-jet appears at the bubble interface away from the particle during the rebound stage.

关键词： Cavitation bubble dynamics particle-bubble interaction second oscillation period high-speed photography

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Collision and attachment behavior between fine cassiterite particles and H_2 bubbles

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Transactions of Nonferrous Metals Society of China 2014年第2期24卷 520-527页

作者：任浏祎张一敏覃文庆包申旭王军武汉理工大学资源与环境工程学院武汉430070 中南大学资源加工与生物工程学院长沙410083

particle-bubble interaction during electro-flotation of cassiterite was investigated by determining the recovery of cassiterite and the collision mechanism of cassiterite particle and H2 bubble. Flotation tests at different conditions were conducted in a single bubble flotation cell. The recovery of cassiterite was found to be affected by cassiterite particle and bubble size. A matching range, in which the best recovery can be obtained, was found between particle and bubble size. Collision, attachment, and detachment of the particle-bubble were observed and captured by a high-speed camera. particle-bubble collision and attachment were analyzed with the use of particle-bubble interaction theory to obtain the experimental results. An attachment model was introduced and verified through the photos captured by the high-speed camera. A bridge role was observed between the bubbles and particles. particle-bubble interaction was found to be affected by bubble size and particle size, which significantly influenced not only the collision and attachment behavior of the particles and bubbles but also the flotation recovery of fine cassiterite particles.

关键词： cassiterite fine particle flotation particle-bubble interaction collision and attachment

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Electro-flotation and collision-attachment mechanism of fine cassiterite

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Transactions of Nonferrous Metals Society of China 2012年第4期22卷 917-924页

作者：覃文庆任浏祎王佩佩杨聪仁张雁生中南大学资源加工与生物工程学院长沙410083

In order to discuss the particle-bubble interaction during the electro-flotation of cassiterite,the recovery of cassiterite with different particle sizes was investigated,and the collision mechanism between the cassiterite particles and H2 bubbles was *** flotation tests were carried out in a single bubble flotation *** results show that cassiterite particles 10 μm,10-20 μm,20？38 μm and 38-74 μm match with bubbles with size of 50-150 μm,about 250 μm,74 μm and 74 μm,respectively,and a better recovery can be *** is demonstrated that the recovery of cassiterite is influenced by the size of cassiterite particles and ***,the probabilities of collision,adhesion,detachment and collection were calculated using the collision,attachment and collection *** calculation results show that the collision probability decreases sharply with decreasing particle size and increasing bubble size（below 150 μm）.The attachment probability would increase from the effective collision,leading to the increase of recovery.

关键词： cassiterite particle-bubble interaction fine particle flotation electro-flotation collision-attachment probability

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