单锥轻质分散相液—液水力旋流器的内流场预测  

THEORETICAL PREDICTION OF FLOW FIELD INSIDE SINGLE-CONELIQUID-LIQUID HYDROCYCLONES SEPARATING LIGHT DISPERSIONS

作　　者：赵庆国[1] 夏国栋[1] 张明贤[2] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100022 [2]北京联合大学生物化学工程学院,北京100023

出　　处：《安全与环境学报》2003年第4期38-42,共5页Journal of Safety and Environment

基　　金：北京市自然科学基金项目 (编号 :80 32 0 0 6)

摘　　要：本文采用内流场模型 ,计算了轻质分散相液—液旋流器内的流线分布与速度分量。结果表明 :轻质分散相旋流器内的流线分布状况明显不同于固—液旋流器。理论预测的轴向速度分布能够与实测数据很好地吻合 ;切向流速分布随轴向位置有微量的变化 ,与径向坐标之间的关系可按半自由涡形式拟合 ,但拟合出的指数约在 0 .35～ 0 .39之间 ,明显低于固—液旋流器中相同的指数 ;径向速度分量明显随轴线位置变化 ,与径向位置之间成线形关系。径向速度分量与轴向速度和切向速度相比大约小两个数量级。Flow field inside hydrocyclones affects the separation characteristics and pressure distributions. More focus has been put on the flow field inside solid-liquid hydrocyclones, while less research can be found for liquid-liquid hydrocyclones in the past literatures. The aim of the present paper is to theoretically reveal the characteristics of flow field inside hydrocyclones for separating light dispersions. The theoretical prediction is based on the fluid flow model developed previously by the author, which has been used to establish the separation model. Though the separation model has been verified with Thew's experimental data, the fluid flow model itself has not been testified. In this paper, the fluid streamlines and velocity components are predicted. It is illustrated that the streamline pattern in a light dispersion hydrocyclone is apparently different from that in a solid-liquid hydrocyclone. The theoretically predicted axial velocity components are in very good agreements with correlations from Colman's experimental results. Tangential velocity component has a slight change with axial position, whereas this kind of change will not be identified by experimental data. The relationship of tangential velocity with radial coordinate can be correlated in the form of semi free vortex with index falling within the range of 0.35~0.39, much lower than those for solid-liquid hydrocyclone. In contrast, radial velocity changes greatly with axial position, and approximately has linear relationship with radial distance. It is found from calculated results that radial velocity is lower than axial and tangential velocities by about 2 orders of magnitude.

关 键 词：采矿环境工程 油水分离 水力旋流器 内流场 速度分布 

分 类 号：TD711[矿业工程—矿井通风与安全]