海泡石颗粒重力分级的数值模拟

Numerical simulation of gravity classification of sepiolite particles

周友行, 吴冲, 杨文佳, 邹鑫, 闫宋祥, 钟垂

（湘潭大学机械工程与力学学院, 湖南湘潭411105）

引用格式：周友行, 吴冲, 杨文佳, 等. 海泡石颗粒重力分级的数值模拟[J]. 中国粉体技术, 2023, 29(6): 16-26.

ZHOU Y H, WU C, YANG W J, et al. Numerical simulation of gravity classification of sepiolite particles[J]. China Powder Science and Technology, 2023, 29(6): 16-26.

DOI：10.13732/j.issn.1008-5548.2023.06.002

收稿日期：2023-06-21,修回日期：2023-08-17,在线出版时间：2023-10-09 10:05。

基金项目：国家自然科学基金项目,编号:52175254;湖南省研究生科研创新项目,编号:CX20220603。

第一作者简介：周友行(1971—),男,教授,博士,博士生导师,研究方向为数字化设计与制造。E-mail: zhouyouhang@xtu.edu.cn。

摘要：为了筛选出多种粒径的海泡石颗粒产品,设计一种重力式分级器。针对气体和海泡石颗粒组成的气-固两相流体建立欧拉-拉格朗日两相模型,求解海泡石颗粒分级过程的运动特性;通过分析海泡石颗粒的运动轨迹、位置等运动特性和各级出口处的颗粒粒径分布,确定各级出口的区间分布。结果表明:海泡石颗粒的粒径越小,受分级气流的影响越大;通过分析不同粒径海泡石颗粒在不同时刻的位置,划分出颗粒的分级区间;根据各级出口的颗粒粒径分布分析,确定粒径为1～10 μm的海泡石颗粒表现出更集中的粒径分布,更好的单分散性。

关键词：重力分级; 海泡石颗粒; 多粒径; 气-固两相流; 数值模拟

Abstract：To screen a wide range of particle sizes of seafoam particle products, a gravity classifier was designed. The gas and seafoam particles form a gas-solid two-phase fluid to establish an Eulerian-Lagrangian two-phase model to solve the kinematic characteristics of the classification process of seafoam particles. By analyzing the motion characteristics of seafoam particles such as trajectory and position and the particle size distribution at the exit of each level, the interval distribution of the exit of each level was determined. The results show that the smaller the particle size of the seafoam particles is the more they are affected by the graded airflow. The grading interval of particles is divided by analyzing the positions of seafoam particles with different particle sizes at different moments. According to the particle size distribution at the exit of each level, seafoam particles from 1 μm to 10 μm show more concentrated particle size distribution and better monodispersity.

Keywords：gravity classification; seafoam particles; multi-grain size; gas-solid two-phase flow; numerical simulation

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