表面亲水改性对液滴斜面滚动性能的影响  

Effect of Surface Hydrophilic Modification on Rolling Performance of Droplets

作　　者：张永波 崔海航[1] 张鸿雁[1] ZHANG Yongbo;CUI Haihang;ZHANG Hongyan(School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology)

机构地区：[1]西安建筑科技大学环境与市政工程学院

出　　处：《建筑热能通风空调》2019年第4期40-44,共5页Building Energy & Environment

基　　金：国家自然科学基金(No.51505362);国家自然科学基金青年基金(No.11602187);陕西省教育厅专项科研计划(15JK1385)

摘　　要：为了解表面亲水性改变对液滴在斜面上的滚动性能影响,本文选取荷叶作为疏水材料,通过溅射不同厚度金属铂的方式对表面进行处理,模拟表面疏水性的退化,随后实验研究了不同倾角斜面上液滴的滚动规律。结果表明,液滴以匀加速的形式在各表面上滚动,且随喷铂时长增加静态接触角减小,加速度减小,阻力增加。随倾角增加,液滴接触长度增加、阻力增加,且与倾角都有线性关系。另外,通过建立滚动阻力模型,确定了阻力与接触宽度和接触角的关系式。随后又推导了滚动加速度的表达式,显示其可由静态接触角和斜面倾角直接计算,进而预测疏水表面上液滴滚动能力。In order to understand the effect of surface hydrophilicity on the rolling properties of droplets on the inclined surface, the lotus leaf was selected as hydrophobic material and was treated by sputtering different thickness of metal platinum to simulate the surface hydrophobicity degradation. Then the rolling law of droplets on different inclined surfaces was studied. The results show that the droplets are rolling on the surface in the form of uniform acceleration, and the static contact angle and the acceleration decrease with the increase of the time of the spray platinum, but the resistance increases. And as the inclination angle increases, the droplet contact length and the resistance increase, and there is a linear relationship with the inclined angle. In addition, the relation between the resistance and contact width and contact angle was determined by establishing the rolling resistance model, and the expression of the rolling acceleration was derived, showing that it can be calculated directly from the static contact angle and the inclined angle, and then predicted the rolling ability of the droplet on the hydrophobic surface.

关 键 词：疏水表面 液滴滚动 滚动规律 接触角 接触长度 

分 类 号：O35[理学—流体力学]