共轴微通道NaAlg-Oil两相流的实验研究  

The Study on NaAlg-Oil Two-phase Flow in Coaxial Microchannel

作　　者：张金松[1] 艾凯 王志亮[2] ZHANG Jinsong;AI Kai;WANG Zhiliang

机构地区：[1]上海大学机电工程与自动化学院,上海200444 [2]上海大学力学与工程科学学院,上海200444

出　　处：《计量与测试技术》2020年第7期14-17,共4页Metrology & Measurement Technique

基　　金：国家重点研发计划(课题编号:2017YFB0404503)。

摘　　要：本文以海藻酸钠溶液(1%wt)为分散相、豆油为连续相,研究竖直共轴微通道的两相流动特性。在两相流型图中,存在Slug、Dripping、Jetting三种流型,Dripping流型的区域最大,Slug和Jetting流型的区域较小,流型转变机理不相同。在Dripping流型区域,微滴长度随着连续相流量的增大而减小;微滴频率随着连续相流量的增大而增大。在Jetting流型区域,微滴长度随着连续相流量的增大减小,微滴频率随着连续相流量的增大而增大。两种流型之间存在微滴长度和频率的拐点。随着分散相流量的增加,非牛顿流体海藻酸钠溶液的粘度下降,分散相的粘性力减小、惯性力增加,微滴长度和微滴频率都增大。This paper studied the liquid-liquid two-phase flow in the vertical coaxial microchannel by applying the sodium alginate solution( 1% wt) as the dispersed phase and the soybean oil as the continuous phase. There were three flow patterns,which were Slug,Dripping and Jetting existing in the pattern regime of two-phase flow. The three flow patterns corresponded with the different mechanisms for the microdroplet formation. In the major region of Dripping flow,the droplet length decreased and the droplet frequency increased with the flow rate of continuous phase increasing. In the minor region of Jetting flow,the droplet length decreased and the droplet frequency increased much rapidly with the flow rate of continuous phase increasing. The inflection point between the two flow patterns governed the transition trend in both droplet length and frequency. Due to the features of non-Newtonian fluid,the sodium alginate solution decreased the viscosity and the viscous force,inversely increased the inertial force increase,the droplet length and frequency to match the flow rate of dispersed phase increasing.

关 键 词：海藻酸钠溶液 非牛顿流体 两相流 共轴微通道 

分 类 号：TB937[一般工业技术—计量学]