Yang Qingzhen, Liu Yankui, Jia Xinmiao, Zhang Tingting, Tian Hongmiao, Fan Jing, Xu Quange, Song Fenhong
The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China.
Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China.
Phys Rev E. 2022 Jul;106(1-2):015111. doi: 10.1103/PhysRevE.106.015111.
It is well known that surface tension is dependent on temperature, and thus a nonuniform temperature may cause thermocapillary flow which is referred to as the Marangoni effect. For a thin liquid-air film confined between a flat hot plate and a topographical cold template, it undergoes deformation due to thermocapillary flow. This phenomenon is termed as thermocapillary patterning, and has been used to fabricate micro- and nanostructure in polymer films. In most cases, the obtained structure conforms to the template; i.e., it can be considered as a replication technique. In this paper, we developed a two-phase flow numerical model based on the phase field to study the dynamic process of thermocapillary patterning. As a remeshing-free method, the phase field enables the incorporation of thermal field and multiphase flow with free surface deformation. The numerical model was employed to study the dynamic process of thermocapillary patterning. Meanwhile, the effects of some parameters, e.g., temperature, geometry parameters, and contact angle, were also investigated.
众所周知，表面张力取决于温度，因此温度不均匀可能会导致热毛细流动，即所谓的马兰戈尼效应。对于夹在平板热板和地形冷模板之间的薄液-气膜，它会因热毛细流动而发生变形。这种现象被称为热毛细图案化，并且已被用于在聚合物薄膜中制造微结构和纳米结构。在大多数情况下，所获得的结构与模板相符；也就是说，它可以被视为一种复制技术。在本文中，我们基于相场开发了一种两相流数值模型，以研究热毛细图案化的动态过程。作为一种无需重新网格化的方法，相场能够将热场和具有自由表面变形的多相流结合起来。该数值模型被用于研究热毛细图案化的动态过程。同时，还研究了一些参数的影响，例如温度、几何参数和接触角。
