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Mesoscopic Dynamics of Fluid in the vicinity of Moving Solid-Liquid-Gas Boundary Line (Contact Line)

移动固-液-气边界线（接触线）附近流体的细观动力学

基本信息

批准号：
17560193
负责人：
UENO ICHIRO
金额：
$ 2.34万
依托单位：
Tokyo University of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17560193/
关键词：
contact line wettability precursor film molecular dynamics

项目摘要

A series of study were carried out with a special interest on the dynamics of the fluid in the vicinity of the boundary line of three phases; solid-liquid-gas interface. A spreading droplet on a solid substrate is accompanied with the movement of a visible boundary line so-called 'macroscopic contact line.' Existing studies have indicated there exits a thin liquid film known as 'precursor film' ahead of the macroscopic contact line of the droplet. The present authors focused on the early stage of spreading and dedicated their special effort to detect the advancing edge of the precursor film by applying an interferometer with a high-speed camera and by noise cancellation of using time-frequency analysis of brightness variation. The authors estimated the precursor film length for comparison with theoretical predictions, and also investigated the effect of changing viscosity on the precursor film by using the present method of detection. In addition, wetting/dewetting process was investigated on a microscopic point of view; a numerical simulation by classical molecular dynamics was conducted to evaluate an instability arosen on a nanometer-scale liquid culumn. The target geometries were (1) liquid column on a sold surface and (2) liquid column wrapping a thin wire. The authors focused on Rayleigh-Plateau-like instabilityemerging on the liquid column in the deformation process.

对三相边界附近流体的动力学进行了一系列的研究；solid-liquid-gas接口。在固体基材上扩散的液滴伴随着可见边界线的移动，即所谓的“宏观接触线”。现有的研究表明，在液滴的宏观接触线之前存在一层被称为“前驱体膜”的薄液体膜。本文主要研究了前驱体膜扩散的早期阶段，利用高速摄像机的干涉仪和亮度变化时频分析的消噪方法对前驱体膜的前缘进行了探测。用该方法对前驱体膜长度进行了估算，并与理论预测结果进行了比较，同时研究了粘度变化对前驱体膜的影响。此外，从微观角度研究了润湿/脱湿过程；采用经典分子动力学方法对纳米尺度液体柱的不稳定性进行了数值模拟。目标几何形状为：(1)液柱在销售面上，(2)液柱包裹细线。重点研究了变形过程中液柱上出现的瑞利-高原样失稳现象。