圆柱细丝壁面的热流体薄膜涂层流动稳定性和非线性动力学特性研究

A falling film of a thermal fluid driven by gravity down a vertical cylinder has received extensive attentions because it is encountered in many industrial applications, such as coating of insulation on a wire, and the lubrication coating for cracking prevention in glass and polymers. A film of coating flow on a vertical cylinder is a type of classical open flow, in which richness of the dynamics of waves, including traveliing waves, solitary waves, formation of beads or droplets. In recent years, extensive attentions have been focused on the problem of coating flow on a cylindric fiber because of its technology and theoretical importance. The aim of the project is to improve the understanding how the effects of thermocapillarity and the thermo-viscosity of fluids on the stability and dynamics of the coating flow, and provide relevant reference to the requirement of controlling the coating flow in industry processes..turbulent from laminar flow in engineering process.

重力驱动下覆盖于圆柱细丝壁面的热流体薄膜涂层流动在工程实际中存在广泛的应用,例如导线外壁面的绝缘防护膜的制备,以及玻璃和聚合物纤维在操作过程中防破碎的表面润滑。圆柱壁面的流体薄膜涂层流动是一种典型的开放式流动，其中蕴含了丰富的动力学现象，包括行波，孤立波，液滴的形成等。由于重要的工业应用背景和理论研究价值，此流动引起了流体力学界和工程界的广泛关注。本项目拟对重力驱动下的圆柱壁面上的热流体进行线性稳定性分析和非线性演化的直接模拟。项目重点研究热毛细效应和流体的热粘性效应对Rayleigh-Plateau机制引起液层破碎的影响。通过本项目，理论上可以深入揭示界面热效应和热粘性效应对圆柱面上流体薄膜涂层稳定性和界面动力学特性的影响，并且能够为工程上控制热流体薄膜涂层的需求提供有价值的参考 。

重力驱动下覆盖于圆柱细丝壁面的热流体薄膜涂层流动在工程实际中存在广泛的应用,例如导线外壁面的绝缘防护膜的制备,以及玻璃和聚合物纤维在操作过程中防破碎的表面润滑。本项目研究了圆柱壁面上的热流体覆膜流动的线性稳定性和非线性演化。通过对色散关系和非线性行波解的分析，得到了热毛细效应在覆膜流动中对Rayleigh-Plateau机制引起液层破碎的影响规律。通过本项目，理论上揭示界面热效应对圆柱面上流体覆膜流动稳定性和界面动力学特性的起到非常重要的影响，并且能够为工程上控制热流体覆膜动力学行为的需求提供有价值的参考 。