【作者】 范茏； 杨超； 毛在砂；

【Author】 Fan Long, Yang Chao, Mao Zaisha (Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080)

【机构】 中国科学院过程工程研究所；

【摘要】 采用两流体模型和改进的内外迭代法模拟了搅拌釜中固相为细长颗粒的液固两相湍流流场,采用标准的k-ε模型封闭, 用SIMPLE算法求解压力。模拟结果与搅拌釜中固相为球形颗粒时的流场进行比较,速度场基本相同,仅釜中心处速度略有差别。对细长颗粒取向模拟时,与以往文献多以Jeffery方程为研究出发点不同,本文作者直接利用刚体颗粒的运动和转动方程,得到搅拌釜中细长颗粒取向的变化规律。更多还原

【Abstract】 Solid-liquid flow field involved with slender particles in a tank stirred by a standard Rushton turbine is simulated with the two-fluid model using the improved inner-outer method. The standard k-ε model is used to deal with turbulent flow and the SIMPLE algorithm for solving the pressure field. By comparison with the case of equivalent spherical particles, it is found that the flow field of slender particles is similar to that of spherical particles. The only difference is the velocity at the center of the tank. Instead of using the Jeffery equation, the evolution of particle orientation as it follows the liquid flow in a stirred tank is simulated with the help of equation of motion of rigid slender rods.更多还原