Experimental investigation of liquid metal thread breakup in a cross junction  

十字交叉通道中液态金属液滴液丝断裂的实验研究

作　　者：Zhaomiao Liu Chenchen Zhang Siyu Zhao Yan Pang Xiang Wang 刘赵淼;张晨晨;赵思宇;逄燕;王翔

机构地区：[1]School of Mathematics,Statistics and Mechanics,Beijing University of Technology,Beijing 100124,China

出　　处：《Acta Mechanica Sinica》2024年第10期13-23,共11页力学学报（英文版）

基　　金：supported by Beijing Natural Science Foundation(Grant No.1232003);the National Natural Science Foundation of China(Grant Nos.12202020,12272016,and 12172017).

摘　　要：The liquid metal droplet formation is usually accompanied by satellite droplets,thus reducing the monodispersity of droplets.This paper investigates the breakup of liquid metal thread in microchannels through theoretical and experimental methods.The flow regimes are classified into squeezing,transition,and dripping.The important role of the shear force in different regimes is obtained by Micro-PIV.The influences of the Cad,Cac,andλon satellite droplet size are systematically analyzed.The basic geometrical difference of the interfacial profiles is captured,and the phenomenon of satellite droplet formation accompanied by interfacial breakup is analyzed.The effect of squeezing force and shear force affects the size of satellite droplets.Reducing viscosity ratio can suppress satellite droplet formation in three liquid systems.The obtained results can help to improve the goal of producing monodisperse droplets by the microfluidic technology,and enhancing the size control range in emerging micro devices.液态金属液滴的生成过程通常会产生卫星液滴,从而降低液滴的单分散性.本文通过理论和实验方法研究了微通道中液态金属液丝的断裂.生成模式分为挤压、过渡和滴流模式,通过Micro-PIV获得了剪切力在不同生成模式中的重要作用.系统分析了离散相毛细数Cad、连续相毛细数Cac和黏度比λ对卫星液滴生成大小的影响,通过捕捉界面的基本几何差异,分析了界面断裂时卫星液滴的生成.挤压力和剪切力的作用会影响卫星液滴的大小,降低黏度比可抑制三种液体体系中卫星液滴的生成.所得到的结果有助于实现利用微流体技术产生单分散液滴的目标,并提高新兴微型设备的尺寸控制范围.

关 键 词：Liquid metal Cross junction Satellite droplet Force analysis Neck profile 

分 类 号：O346.1[理学—固体力学]