气液固三相湍流环境中气泡破裂对SiC颗粒的影响研究

Effect of bubble burst on Si C particles in gas-liquid-solid three-phase turbulent environment

为解决气液固三相磨粒流抛光加工中气泡破裂对Si C颗粒运动的可控性研究等问题,研究了气液固三相流中近壁面微纳米气泡破裂对周围流场和颗粒的影响,采用Fluent软件中多相流体体积模型与可实现k-ε湍流模型,建立了气液固三相颗粒流气泡破裂动力学模型,得到了气泡破裂对壁面和颗粒的作用规律。利用流场中气泡破裂产生的高速射流对周围颗粒的扰动作用,提高了颗粒切削工件表面动能。研究结果表明:气泡初始直径越小或气泡与颗粒之间的距离越小,都使气泡破裂所产生的局部射流对周围颗粒的影响越大;可为流体精密加工、空蚀、气泡可控性研究提供参考。

In order to solve the problem of controllability of bubble rupture to Si C particles in gas-liquid-solid three-phase abrasive flow polishing process,the influence of micro-nano bubble burst in near wall on the flow field and particles in the gas-liquid-solid three-phase flow was studied. The bubble and particles dynamics model of gas-liquid-solid three-phase abrasive flow was established by multiphase fluid volume（ VOF） model and k-ε turbulence model in the Fluent software,and the effect law of bubble on the wall and particles was obtained. The surface kinetic energy of the workpiece was improved by the disturbance of the high velocity jet caused by the bubble burst in the flow field. The results show that the smaller the initial diameter of the bubble or the smaller the distance between the bubble and the particle,the greater the effect of the local jet caused by the bubble burst on the surrounding particles. The study can provide reference for the research of fluid precision machining,cavitation erosion and bubble controllability.