摘要
采用三维伪势格子玻尔兹曼方法,模拟液滴撞击微结构阵列超疏水表面的过程,分析撞击速度和表面形貌对液滴动力学和接触时间的影响。结果表明,液滴撞击引起的弹跳现象包括正常弹跳和饼状弹跳,其形成主要受撞击速度及微结构阵列间距和高度影响。液滴撞击速度小时表现为接触时间较长的正常弹跳,撞击速度较大时则发生快速的饼状弹跳,有效缩短接触时间。当微结构阵列的表面形貌具有足够的高度和合适的间距时,可使液滴底部与微结构表面的接触滞留时间缩短,防止液滴陷入微结构阵列间隙,进一步实现饼状弹跳。当撞击后能量转换率超过0.038时,会发生较短接触时间的饼状弹跳。
The lattice Boltzmann method is used to simulate the droplet impact on superhydrophobic surfaces with micropillar arrays.The effects of the impact velocity and surface morphology on the droplet kinetics and contact time are analyzed.The results demonstrate that the bouncing phenomenon caused by droplet impact includes normal bouncing and pancake bouncing,the formation of which is mainly affected by the impact velocity and the spacing and height of micropillar arrays.When the droplet impact velocity is small,a normal bouncing with a long contact time occurs.When the impact velocity is large,a rapid pancake bouncing occurs,which effectively shortens the contact time.If the surface morphology of the micropillar array has an enough height and a suitable spacing,the contact retention time between the bottom of the droplet and the micropillar surface can be shortened,and droplet can be prevented from falling into the gap of the micropillar array,further realizing the pancake bouncing.Pancake bouncing with shorter contact time occurs when the energy conversion rate exceeds 0.038.
作者
郭帅
赵心怡
王鑫
陈振乾
GUO Shuai;ZHAO Xinyi;WANG Xin;CHEN Zhenqian(School of Energy and Environment,Southeast University,Nanjing 211189,China;Jiangsu Key Laboratory of Solar Energy Technology,Southeast University,Nanjing 211189,China)
出处
《东南大学学报(自然科学版)》
北大核心
2025年第3期872-879,共8页
Journal of Southeast University:Natural Science Edition
基金
国家自然科学基金资助项目(52306075)
江苏省基础研究专项资金(自然科学基金)资助项目(BK20230849)
中国博士后科学基金资助项目(2023M740591).
