Numerical Investigation on Dropwise Condensation on Rough Structures with and without Non-Condensable Gas

作     者：LI Mingjie ZHOU Wenjing WEI Jinjia TAO Wenquan LI Mingjie;ZHOU Wenjing;WEI Jinjia;TAO Wenquan

作者机构：School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an710049China Key Laboratory of Thermo-Fluid Science and EngineeringMinistry of EducationSchool of Energy&Power EngineeringXi’an Jiaotong UniversityXi’an710049China 

出 版 物：《Journal of Thermal Science》 (热科学学报（英文版）)

年 卷 期：2022年第31卷第2期

页      面：308-317页

核心收录：

学科分类：080701[工学-工程热物理] 08[工学] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 

基　　金：supported by the National Natural Science Foundation of China(grant number:51906190) China Postdoctoral Science Foundation(2019M663702) Fundamental Research Funds for the Central Universities(xjh012019015) innovation team of Shaanxi province(2019TD-039)。 

主　　题：1condensation wetting state lattice Boltzmann method numerical simulation 

摘      要：The geometrical dimensions of the rough structures as well as the non-condensable gases in the vapor mixture can have the great effect on the nucleation position and the wetting state of the droplet,which further influence the condensation heat flux.In this paper,the multispecies multiphase lattice Boltzmann method together with a thermal phase change model is used to investigate the dropwise condensation on a rough surface enhanced with pillars.The effect of the geometric dimensions including pillar height H,pillar width W and pillar space S is investigated.Then the effect of non-condensable gases on the contact angle of a droplet on textured surface is studied.The results show that the local heat flux and the wetting area are higher while the waiting time is shorter at larger S,W and smaller H on the rough surface.The nucleation position rises from the bottom of grooves to the top with the increase of pillar height and the decrease of pillar space.The contact angle is larger and it is easier to maintain the Cassie state for droplet.When there exists non-condensable gas,the non-condensable gas obviously enhances the hydrophobicity of the rough surfaces compared with pure vapor.