Fabrication of a micro-structured surface based on interfacial convection for drag reduction

作     者：DOU ZhaoLiang WANG JiaDao YU Feng CHEN DaRong 

作者机构：State Key Laboratory of TribologyTsinghua UniversityBeijing 100084China China Ship Research and Development AcademyBeijing 100192China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2011年第56卷第7期

页      面：626-632页

核心收录：

学科分类：081702[工学-化学工艺] 081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 081701[工学-化学工程] 

基　　金：supported by the National Natural Science Foundation of China (50721004  50675112) 

主　　题：界面张力梯度 减阻性能 微结构 对流 表面制备 溶剂蒸发 表面加工 喷漆系统 

摘      要：Based on interfacial convection in the presence of solvent evaporation, a novel method for the fabrication of a micro-structured surface is proposed to facilitate drag reduction. A mixture was coated on a substrate through a specially developed spray-painting system. Micron scale pits formed spontaneously in the coated surface because of interfacial convection and deformation driven by the gradient of the interfacial tension. Experimental results indicated that particles in the mixture played a crucial role in pit for-mation, and with a suitable selection of particle size and dosage, the characteristic parameters of the pitting could be controlled. The drag reduction experiments were first performed in a water tunnel, and the results showed that the micro-structured surface had a remarkable drag reduction performance over a great range of flow speeds.