Evolution of symmetrical microvortices in a generating microdroplet during neck breakage stage in an altered T-shaped microchannel

被引：1

作者：

Shen, Feng ^{[1
]}

Yang, Xin ^{[2
]}

Li, Chunyou ^{[2
,4
]}

Wang, Jia ^{[3
]}

Wu, Di ^{[3
]}

Liu, Zhaomiao ^{[1
]}

机构：

[1] Beijing Univ Technol, Sch Math Stat & Mech, Beijing 100124, Peoples R China

[2] Beijing Univ Technol, Coll Mech & Energy Engn, Beijing 100124, Peoples R China

[3] Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China

[4] AVIC Mfg Technol Inst, Beijing 100120, Peoples R China

来源：

EXPERIMENTS IN FLUIDS | 2024年 / 65卷 / 12期

基金：

中国国家自然科学基金;

关键词：

DROPLET FORMATION PROCESS; LIQUID TRANSFER; FLOW; DYNAMICS; PIV; VISUALIZATION;

D O I：

10.1007/s00348-024-03923-9

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Vortices are a fascinating flow phenomenon and an important research topic in fluid mechanics. In this study, the evolution of symmetrical vortices within a generating droplet in an altered T-shaped microchannel was investigated using microparticle image velocimetry (micro-PIV) and high-speed imaging microscopy. Transient flow patterns within the microdroplet were visualized in the focal plane, revealing a high-speed jet flow and two counter-rotating symmetric vortex pairs. These findings suggest that the internal flow field of the microdroplet exhibits intricate three-dimensional structures. The vortical flow behaviors were quantitatively characterized in detail by calculating the vorticity, rotation, shear deformation, and tensile deformation. These results are crucial for comprehending the initial flow dynamics and mixing processes occurring within generating microdroplets.

引用

页数：12