液-液雾化液滴的粒径分布特性

Characteristic of Size Distribution of Drop Formation in Liquid-liquid Atomization Systems

液-液雾化形成液滴的过程是一个动态的和随机的现象,所形成液滴的大小具有不确定性,但在大量的实验条件下,液滴粒径的大小又呈现统计规律性。为了研究不同流量工况下雾化液滴的粒径分布特性,采用数理统计方法作为一种研究手段进行统计分析。研究结果表明:不同的流量工况下,雾化液滴的粒径大小均呈现一定的分布形式,且随流量的增大,粒径分布的中位粒径、标准偏差的总体变化趋势是减小的;同时为了获得能够描述液滴粒径分布的经验表达函数,对3种常用的粒径分布函数Log-Normal分布、Rosin-Rammler分布、Nukiyama-Tanasawa分布,进行了Pearson χ2拟和优度检验,发现在整个实验流量范围内,Rosin-Rammler分布函数均能够比较准确地描述液滴的粒径分布。

Drop formation is a dynamic and stochastic phenomena in the process of liquid-liquid atomization,and drop sizes are of non-determinacy.In order to study drop size distribution,the means of mathematical statistics is employed.With a great deal of experiments,statistical information of drop sizes is presented.The results showed that statistical information of drop sizes is characterized by certain distribution under different flow rates.The whole change trend of medium diameter and standard deviation of the drop size distribution decreases with increasing flux rate.Moreover,three empirical approaches of modeling drop size distribution are introduced,such as Log-Normal,Rosin-Rammler and Nukiyama-Tanasawa.It is found that Rosin-Rammler distribution can exactly describe drop size distribution in the range of experiment flow rates by the method of Pearson χ2 test.