水平管油水分散流液滴粒径及其分布规律研究

油水两相分散流是油水混输管道常见的流型之一,液滴是油水分散流的主要特征,液滴在油水两相管路中受到湍流惯性力、剪切力、界面张力、黏性力等多种力的作用而发生聚结和破裂,从而形成不同的液滴粒径及其分布。本研究采用高速摄像和显微照相两种方法研究了水平管中油水分散流的液滴粒径随混合流量、温度和含油率等参数的变化规律,并利用三种概率分布函数研究了液滴粒径的分布特性。研究结果表明:分散相液滴的Sauter平均直径随混合流量的增加而逐渐减小、随温度升高而逐渐增大、随含油率的增大而增大;液滴粒径的分布规律与Log-Normal和Frechet概率分布函数符合较好。

Investigation of Droplet Sizes and Distributions in Horizontal Oil-Water Dispersed Flows

Oil-water dispersed flow is one of the basic flow patterns of oil-water pipe flows,droplet is the most important character.Droplets in a pipe flow field would coalesce and break up under the forces such as turbulent iuertial force,stress force,interfacial tension and viscous force,which produces different droplet sizes and distributions.This study aims to acquire the relationships between droplet size and different fiow parameters such as mixture flow rate,temperature and oil concentration,high speed video technique and microscope technique have been used to obtain droplet sizes,three probabilistic distributions are used to characterize the experimental droplet size data. The results show that:SMD of the dispersed phase decreases with increasing mixture velocity,while increases with increasing temperature and oil concentration,both the Frechet and the Log-normal distributions could satisfactorily represent the experimental data.