The Simulation Study of Thermal Equilibrium Process during Water Droplets Freezing on Hydrophobic Surface
Since the surface hydrophobic mechanism was understood,it was widely studied and applied.Preliminarily,hydrophobic surface has been used to improve anti-icing performance for power equipment in power system.Current researchers mainly focus on experimental study but overlook the microcosmic freezing mechanism of supercooled droplets on hydrophobic surfaces.Through simulation study on COMSOL Multiphysics 5.0 with parameters from artificial icing condition,this paper simulates the thermal equilibrium process during water drops freezing on hydrophobic surface.In addition,the computational fluid dynamics and thermodynamics combined with finite element method was used to simulate the coalescence process of droplets.The main conclusions are as follows: ① Through heat transfer in fluid with phase change model,this paper found hydrophobicity has great influence on freezing process of water drops: the freezing time of surface with(Static Contact Angle)SCA=150°is 56.25%and 25%longer than SCA= 110° and 120°,respectively.This result proved that hydrophobic surface could delay freezing process and improve the anti-icing ability of power equipment.②Through two phases flow field model,this paper found the coalescent time was gradually increased with the enhance of hydrophobicity,for example: hydrophobic surface with SCA=150° needs double coalescent time longer than SCA=110°,the air gap capacity and the air discharge time will also increase during the enhance of hydrophobicity.According to the simulation result,the air discharge time with SCA=150°will be 1.35 times slower than that of 110°for surfaces with different hydrophobicity.This paper also explains the bubbles that appear under the ice.
hydrophobic surface water drop freezing finite element multi physical field
Wei Meng Jianlin Hu Ke Xu Binhuan Lan
School of Electrical Engineering,Chongqing University Chongqing,China State Grid Suining Power Supply Company Sui Ning,China
国际会议
重庆
英文
1-6
2017-09-25（万方平台首次上网日期，不代表论文的发表时间）