液固悬浮液中气泡生成的数值模拟

Numerical simulation of bubble formation in liquid-solid suspensions

将Level Set方法与硬球离散颗粒方法相结合,建立了一个三相流混合模型。应用该模型对液固悬浮液中气泡从单孔及多孔中的形成过程进行了三维模拟,并与文献中已有的结果进行了定性比较。数值试验主要比较了在悬浮液与纯液体中的气泡生成与上升行为。模拟结果表明,颗粒的存在对气泡的形成与上升有重要影响;气泡诱导的流体流动对气泡与颗粒的运动均有显著地影响。

A hybrid model is presented for numerical simulation of gas-liquid-solid three-phase flows by combining the level set method with the hard sphere discrete particle approach. Three-dimensional simulations of the bubble formation and rising processes from single orifice and multi-orifices were conducted based on the hybrid model in liquid-solid suspensions. The simulated results were qualitatively compared with experimental observations in the literature. The study focuses on the comparison between bubble formation in liquid-solid suspensions and in pure liquid. The simulation results indicate that the presence of the suspended particles significantly affects the bubble formation and its rising processes, and that the liquid flow induced by bubbles has significant effects on the kinetic behaviors of bubbles and particles.