摘要
在不同湿度下研究了不同浓度乙醇/水混合物的液滴在超疏水表面上的蒸发过程,通过实验分析了液滴的接触半径、接触角和蒸发速率随时间的演化规律并与现有理论模型进行对比,探索乙醇浓度和环境湿度对超疏水表面上两组分液滴蒸发动力学行为的影响。研究结果表明:乙醇浓度影响液滴在超疏水表面上的蒸发模式和蒸发速率,低乙醇浓度(≤20wt%)时液滴蒸发速率较慢并趋向于常接触角(CCA)模式,高乙醇浓度(40wt%～60wt%)时液滴蒸发速率更快并趋向于常接触半径(CCR)模式;环境湿度主要影响液滴的蒸发速率但对蒸发模式的作用小,湿度越高蒸发速率越慢。
The evaporation of water/ethanol droplets on superhydrophobic surface is experimentally studied,considering different ethanol concentrations and relative humidity. The temporal evolutions of different parameters,including the contact radius between the liquid droplets and the surface,the contact angles and the evaporation rates,are analyzed and compared with existing theoretical models. The effects of ethanol concentration and relative humidity on the evaporation dynamics are explored. It is shown that the evaporation modes and evaporation rates are greatly affected by ethanol concentration. Droplets with lower ethanol concentrations(≤20 wt%) tend to evaporate at a low rate,staying in the constant contact angle( CCA)mode nearly in the whole process,while those with higher ethanol concentration( 40 wt%~ 60 wt%) evaporate faster and take the constant contact radius( CCR) mode. The evaporation rate decreases significantly when the relative humidity is increased and vice versa. However,the relative humidity has little impact on the evaporation mode.
作者
胡逸男
赵彬钰
陈龙泉
HU Yi’nan;ZHAO Binyu;CHEN Longquan(School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China)
出处
《四川理工学院学报（自然科学版）》
CAS
2019年第2期8-13,共6页
Journal of Sichuan University of Science & Engineering(Natural Science Edition)
基金
四川省青年科技基金(2016JQ0050)
关键词
液滴蒸发
超疏水表面
乙醇浓度
湿度
蒸发模式
drop evaporation
superhydrophobic surface
ethanol concentration
relative humidity
evaporation mode
