液-液两相流体黏度对微通道内流型的影响  

Effects of liquid-liquid two-phase flow with different viscosities on flow patterns in microchannels

作　　者：钱锦远[1,2] 李文庆 李晓娟[1] 马哲辉[1] 金志江 QIAN Jinyuan;LI Wenqing;LI Xiaojuan;MA Zhehui;JIN Zhijiang(Institute of Process Equipment,College of Energy Engineering,Zhejiang University,Hangzhou 310027,China;State Key Laboratory of Fluid Power and Mechatronic Systems,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学能源工程学院化工机械研究所,浙江杭州310027 [2]流体动力与机电系统国家重点实验室,浙江杭州310027

出　　处：《高校化学工程学报》2023年第3期350-358,共9页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(52175067)。

摘　　要：为了研究流体黏度对液-液两相流流型的影响,采用实验和数值模拟相结合的方法,研究十字型微通道内液-液两相流流型变化。结果表明,当两相流体系中存在高黏度流体时,会加剧两相界面的不稳定性,两相流流型极易向不规则流和环状流转换,且当连续相流体黏度较高时,液滴的形状更易为子弹流。通过引入毛细数和韦伯数,提出两相流流型转换关系。当连续相流体和分散相流体分别由水平通道和垂直通道流入时,通过合理调节两相流体流速,可在微通道下游实现大小液滴的融合。这一方式将为高黏度流体流动操控提供新思路,通过控制两相流速,可以实现不依赖于复杂微通道结构的液滴被动融合。The transition of liquid-liquid two-phase flow patterns in Cross-junction microchannel were investigated for clarifying the effect of two-phase viscosity on flow patterns by experimental and numerical method.Results showed that the introduction of liquid with high viscosity might induce the instability of two-phase interface.The flow patterns easily transited to irregular flow and annular flow,and the shape of liquid droplet was bullet when the viscosity of continuous phase fluid was high.A two-phase flow regime transition relationship was proposed by correlating Capillary number and Weber number.By adjusting the two-phase fluid velocities reasonably,the adjacent droplets coalesced with flowing downstream the microchannel when the continuous phase and dispersed phase were injected into the microchannel horizontally and vertically respectively,which provide a new approach for achieving the passive droplet coalescence with simple construction of microchannel by controlling the two-phase flow rate.

关 键 词：流型 黏度 微通道 液滴融合 

分 类 号：TQ021.1[化学工程]