在改变的 T 型微通道中，产生微滴的颈部断裂阶段中对称微涡的演变

IF 2.3 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experiments in Fluids Pub Date : 2024-11-22 DOI:10.1007/s00348-024-03923-9

Feng Shen, Xin Yang, Chunyou Li, Jia Wang, Di Wu, Zhaomiao Liu

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引用次数: 0

摘要

旋涡是一种迷人的流动现象，也是流体力学的一个重要研究课题。本研究利用微颗粒图像测速仪（micro-PIV）和高速成像显微镜研究了在改变的 T 形微通道中产生的微滴内对称涡旋的演变过程。在焦平面上观察到了微液滴内部的瞬态流动模式，发现了高速喷射流和两个反向旋转的对称漩涡对。这些发现表明，微液滴的内部流场呈现出错综复杂的三维结构。通过计算涡度、旋转、剪切变形和拉伸变形，对涡流行为进行了详细的定量表征。这些结果对于理解产生微滴的初始流动动力学和混合过程至关重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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

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

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.

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来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.