小直径水力旋流器微细分级模型

MODEL OF SMALL DIAMETER HYDROCYCLONE IN CLASSIFICATION OF ULTRAFINE PARTICLES

小直径水力旋流器直径小，离心力场强，液流微观结构复杂，研究难度大。从流体宏观结构和微细颗粒的群态运动入手，提出了“紊流携带模型”，探讨用新的参数研究小直径旋流器微细分级的规律。阐明了“紊流携带模型”的基本观点和“相对携带量”、“分级粒度ｄｒ”、“溢流水量分配”等主要参数的物理概念。在实验研究的基础上，建立了与旋流器结构和操作参数相关的溢流水量分配、分级粒度、相对携带量３个数学方程。高岭土微细分级实验表明数学方程计算值与实验值吻合较好。

Based on the analysis of fluid microstructure and the group movement of ultrafine particles, the turbulence carrying model has been proposed and it has been used to explain the law of classification of ultrafine particles in the small diameter hydrocyclone with new parameters. The basic idea about “turbulence carrying model”and the physical concepts for the main parameters, such as relative carrying capacity, separation size d r , distribution of overflowing water, have been delineated. Based on the experiment, three equations for distribution of overflowing water, separation size and relative carrying capacity were established, which are interrelated with the structure and the operation parameters of hydrocyclones. The experiment of the kaolin classification of ultrafine particles showed that the computation value coincides well with the experimental value. The model can be applied to the theoretical study of the classification of small diameter hydrocyclone and the computation of process index to some degrees.