离散型织构表面液滴的铺展及其接触线的力学特性分析

发布时间：2018-02-10 05:33

本文关键词： 离散型织构铺展润湿因子力学特性钉扎效应　出处：《力学学报》2016年02期 　论文类型：期刊论文

【摘要】：针对离散型织构表面上液滴的铺展过程,采用数值模拟和润湿性实验相结合的方法,引入织构润湿因子θ*,得到了不同类型的离散型织构对固体表面润湿性的影响,在此基础之上分析了液滴铺展过程中接触线的力学特性,以期从微观界面力学的角度解释微织构对液滴铺展过程的促进作用.研究表明:离散型织构增大了液滴铺展过程中的固-液接触面积,位于铺展前沿的液体分子部分浸润织构内部,导致液面曲率和液滴内部的拉普拉斯压力增大,相邻离散型织构间的液体获得了额外的驱动力和能量,铺展速度加快,平衡接触角减小;槽状离散型织构对表面润湿性的影响程度最大,液滴在其上铺展过程具有各向异性特性.另外数值仿真分析表明,接触线的钉扎效应与固体表面粗糙度的大小和微织构类型密切相关,表面粗糙度越大,钉扎效应越明显,其中槽状织构对接触线的钉扎作用还具有方向性.
[Abstract]:In view of the spreading process of droplets on the surface of discrete texture, the effect of different types of discrete texture on the wettability of solid surface is obtained by using the method of numerical simulation and wettability experiment, and introducing the wettability factor 胃 of the texture. On this basis, the mechanical properties of the contact line in the process of liquid droplet spreading are analyzed. The results show that the discrete texture increases the solid-liquid contact area in the process of droplet spreading. The liquid molecules at the spreading front partially infiltrate the texture, which increases the surface curvature and the Laplace pressure inside the droplets. The liquid between adjacent discrete textures gains additional driving force and energy, and the spreading speed is accelerated. The equilibrium contact angle is reduced, the effect of groove texture on surface wettability is greatest, and the droplet spreading process is anisotropic. The pinning effect of contact line is closely related to the size of solid surface roughness and the type of microtexture. The greater the surface roughness, the more obvious the pinning effect is.
【作者单位】：合肥工业大学摩擦学研究所;
【基金】：国家自然科学基金(51375132,11472096) 中央高校基本科研业务费专项资金资助项目
【分类号】：O35

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