液滴撞击楔形化学非均匀表面的定向反弹  

Directional Rebound of Water Droplet Impacting a Wedge-shaped Heterogeneous Surface

作　　者：焦丽丽 王欣[1,2] 易孟超 高淑蓉 王晓东 JIAO Lili;WANG Xin;YI Mengchao;GAO Shurong;WANG Xiaodong(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources,North China Electric Power University,Beijing.102206,China;Research Center of Engineering Thermophysics,North China Electric Power University,Bejing 102206,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]华北电力大学工程热物理研究中心,北京102206

出　　处：《工程热物理学报》2022年第9期2415-2422,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金重点项目(No.51936004);国家自然科学基金创新研究群体项目(No.51821004);国家自然科学基金青年基金项目(No.52006068);北京市自然科学基金(No.3212025);中央高校基本科研业务费专项资金资助(No.2020MS063)。

摘　　要：近年来,通过操控液滴进行液滴界面输运特性的有效调控在能源利用、相变储能、强化传热等领域越来越重要。功能性表面,作为操控液滴运动的被动方法,以其节约能源、易于制备的优点,在自清洁、水管理、微流控、防污染等工程应用中具有重要的研究前景。本文基于格子波尔兹曼方法,设计了在超疏水表面上嵌入楔形疏水结构的化学非均匀表面,通过调节表面润湿性梯度和楔形顶角实现操控撞击液滴的定向反弹,并且基于对液滴反弹倾斜角、定向位移、接触时间以及恢复系数的分析来研究表面润湿性梯度和楔形顶角对这一物理过程的影响,为实际应用中精准操控液滴定向反弹提供一定的理论指导。In recent years, effective control of interface transport characteristics by droplet manipulation plays an increasingly important role in engineering technologies, such as energy utilization,phase change energy storage, heat transfer enhancement, and so forth. Surface functionalization, as a passive method to manipulate the movement of water droplet, has important application prospects in many aspects, for example, self-cleaning, water management, microfluidics, anti-pollution, due to the advantages of energy saving and easy preparation. Based on the lattice Boltzmann method, this paper proposes a wedge-shaped heterogeneous surface, in which a wedge-shaped hydrophobic region is embedded in the super-hydrophobic surface. It is found that utilizing the wettability gradient and the wedge angle on the surface can manipulate the directional rebound of impacting droplet.Effects of the wettability gradient and the wedge angle of hydrophobic area in this physics process are systematically investigated, through many parameters of rebound angle, directional displacement, contact time and restitution coefficient. The results in this paper would be helpful for the design of advanced functional surfaces to manipulate droplets directional rebound precisely in real applications.

关 键 词：液滴撞击 楔形 化学非均匀表面 定向反弹 数值模拟 

分 类 号：TK123[动力工程及工程热物理—工程热物理]