低雷诺数下不规则颗粒沉降阻力公式的改进和验证  

Improvement and verification of the formula of settling resistance of irregular particles at low Reynolds number

作　　者：雷中云 邓荣东[1,2] 姜克冰 库建刚[1,2] LEI Zhongyun;DENG Rongdong;JIANG Kebing;KU Jiangang(Zijin School of Geology and Mining,Fuzhou University,Fuzhou,Fujian 350108,China;Fuzhou University-Zijin Mining Group Joint Research Center for Comprehensive Utilization of Mineral Resources,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学紫金地质与矿业学院,福建福州350108 [2]福州大学—紫金矿业集团矿产资源综合利用联合研发中心,福建福州350108

出　　处：《福州大学学报（自然科学版）》2022年第2期271-277,共7页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51674091,51804080)。

摘　　要：针对低雷诺数下不规则颗粒的沉降阻力公式F_(阻)=12Aμu/d_(p)中,颗粒当量直径A不足以反映其三维形状对阻力所产生影响的问题,引入球形度系数k,得到改进阻力公式F_(阻)=12/k·A_(1)μu/d_(p).经过计算机模拟和实验验证,结果表明:改进公式在高粘度、小粒径的情况下具有良好的适用性,能够显著提高计算的准确度,且颗粒的球形度越高,计算结果相对偏差越小.改进公式丰富了低雷诺数下不规则颗粒沉降理论,对选厂尾矿沉降、浓密等作业的工艺计算具有重要的参考价值.Aiming at the problem that in the settlement resistance formula F_(阻)=12Aμu/d_(p) of irregular particles at low Reynolds number,the particle equivalent diameter A is not enough to reflect the influence of its three-dimensional shape on the resistance.The sphericity coefficient k is introduced to obtain an improved resistance formula F_(阻)=12/k·A_(1)μu/d_(p).Simulation and experimental results show that the improved formula has good applicability in the case of high viscosity and small particle size,and can significantly improve the accuracy of calculation,and the higher the sphericity of particles,the smaller the deviation of the improved formula.The improved formula enriches the theory of settling irregular particles and has certain reference value for the process calculation of settling and thickening of tailings in the concentrator.

关 键 词：流体阻力 低雷诺数 不规则颗粒 沉降 球形度 

分 类 号：TD91[矿业工程—选矿]