CO2液滴在粗糙固体壁面上的润湿特性
Wetting behaviors of CO2 droplets on rough solid substrate
宋粉红 1姜瑜辉 1王志远 1王忠旭 1范晶1
作者信息
- 1. 东北电力大学能源与动力工程学院,吉林 132012
- 折叠
摘要
CO2 在粗糙固体壁面上的润湿行为对CO2 冷凝捕集技术具有重要意义.采用分子动力学方法探究微结构、势能及温度对CO2 液滴润湿的影响.结果表明:相较于平板壁面,微结构壁面提高了CO2 液滴的接触角;在微结构壁面上势能参数影响CO2 液滴的润湿状态,在栏栅结构壁面上CO2 液滴从Cassie-Baxter状态转向Wenzel状态,而在三角和斜坡结构壁面上CO2 液滴均保持Wenzel状态,3 种壁面上CO2 液滴的接触角均随势能参数的增大而减小;此外随着体系温度升高,CO2 分子克服界面能垒由液相转向气相,使得液滴尺寸变小,液滴的接触角稍有减小.
Abstract
Understanding the role of rough solid substrates on the CO2 droplet's wetting characteristics is of importance for CO2 capture by dropwise condensation.The molecular dynamic method was adopted to investigate the effect of microstruc-tures,potential energy and temperature on the wetting behaviors of CO2 droplets.The results show that the contact angle of CO2 droplets is enhanced on the microstructured substrate in comparison with the smooth substrate.The wetting state of the CO2 droplets is affected by the potential energy parameters on the micro-structured substrate.On the solid surface with fence structures,the CO2 droplets change from the Cassie-Baxter state to the Wenzel state,while on the surface with the triangular and ramp structures CO2 droplets are always at the Wenzel state.With the increase of the potential energy parameters,all the corresponding contact angles of CO2 droplets on the three solid surfaces decrease.Moreover,as the temperature increases,the CO2 molecules overcome the interface energy barrier from the liquid phase to the gas phase,resulting in the decrease of the droplet size.The contact angle of droplets decreases very slightly with the increase of temperature.
关键词
粗糙壁面/润湿性/CO2液滴/接触角/分子动力学Key words
roughness wall/wettability/CO2 droplet/contact angle/molecular dynamics引用本文复制引用
基金项目
吉林省自然科学基金(20210101088JC)
出版年
2024
国家科技期刊平台
NSTL
万方数据