Fluid wetting and penetration characteristics in T-shaped microchannels

IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Experiments in Fluids Pub Date : 2024-11-09 DOI:10.1007/s00348-024-03906-w
Huijie Zhang, Anja Lippert, Ronny Leonhardt, Tobias Tolle, Luise Nagel, Tomislav Marić
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Abstract

A thorough understanding of media tightness in automotive electronics is crucial for ensuring more reliable and compact product designs, ultimately improving product quality. Concerning the fundamental characteristics of fluid leakage issues, the dynamic wetting and penetration behavior on small scales is of special interest and importance. In this work, four T-shaped microchannels with one inlet and two outlets are experimentally investigated in terms of contact angle dynamics and interface movement over time, generating novel insight into the wetting mechanisms and fluid distribution. With a main channel width of 1 mm, a crevice width of \(w = {0.3}\,\hbox {mm}, {0.4}\,\hbox {mm}\) and a rounding edge radius of \(r = {0.1}\,\hbox {mm}, {0.2}\,\hbox {mm}\), the geometrical effects on the fluid penetration depth in the crevice and the interface edge pinning effect are analyzed quantitatively using an automated image processing procedure. It is found that the measured dynamic contact angles in all parts can be well described by molecular kinetic theory using local contact line velocities, even with local surface effects and abrupt geometry changes. Moreover, a smaller crevice width, a sharper edge and a larger flow velocity tend to enhance the interface pinning effect and prevent fluid penetration into the crevice. The rounding radius has a more significant effect on the interface pinning compared with crevice width. The experimental data and image processing algorithm are made publicly available.

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T 型微通道中的流体润湿和渗透特性
透彻了解汽车电子产品中的介质密封性对于确保更可靠、更紧凑的产品设计,最终提高产品质量至关重要。关于流体泄漏问题的基本特征,小尺度上的动态润湿和渗透行为具有特殊的意义和重要性。在这项研究中,我们对四个具有一个入口和两个出口的 T 型微通道进行了接触角动态和界面随时间移动的实验研究,从而对润湿机制和流体分布有了新的认识。主通道宽度为 1 毫米,缝隙宽度为(w = {0.3}\\hbox {mm}, {0.4}\hbox {mm}\),圆边半径为(r = {0.1}\\hbox {mm}, {0.2}\hbox {mm}\),利用自动图像处理程序定量分析了缝隙中流体渗透深度的几何效应和界面边缘的钉扎效应。结果发现,即使存在局部表面效应和几何形状的突然变化,所有部分测得的动态接触角都可以用分子动力学理论的局部接触线速度很好地描述。此外,较小的缝隙宽度、较尖锐的边缘和较大的流速往往会增强界面针销效应,防止流体渗入缝隙。与裂缝宽度相比,圆角半径对界面针化的影响更为显著。实验数据和图像处理算法已公布于众。
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来源期刊
Experiments in Fluids
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.
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