Lateral Drop Rebound on a Hydrophobic and Chemically Heterogeneous Surface
Lateral Drop Rebound on a Hydrophobic and Chemically Heterogeneous Surface
复制标题
疏水性和化学异质表面上的横向跌落反弹
DOI：
10.1021/acs.langmuir.1c00242
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Binghai Wen
中科院分区：
文献类型：
--
作者：
Tingting Ji;Yongcai Pan;Yufu Shao;Bing He;Binghai Wen
本文用多相格子Boltzmann方法研究了液滴从疏水和化学非均质表面反弹的过程。液滴的反弹行为取决于表面的疏水程度和非均质性。表面均匀时，液滴垂直回弹，液滴高度随表面疏水性的增强而增大。对于具有两个不同疏水部分的非均质表面，液滴向较低疏水侧横向反弹。由于高疏水侧比低疏水侧在接触线上施加更大的不平衡杨氏力，力的不同导致了不对称反弹。相图显示了液滴撞击各种化学均质和非均质表面的回弹数。通过表面接触角对弹跳高度和飞行时间进行了简单的定量估算。这项工作促进了对液滴撞击化学非均质表面的反弹机理的理解，并为精确控制疏水和非均质表面反弹液滴的横向行为提供了指导策略。
In this paper, the process of a drop rebounding from a hydrophobic and chemically heterogeneous surface is investigated using the multiphase lattice Boltzmann method. The bounce behavior of drops is dependent on the degree of hydrophobicity and heterogeneity of the surface. When the surface is homogeneous, the drop rebounds vertically and the height increases with the enhancement of the surface hydrophobicity. For the heterogeneous surface with two different hydrophobic parts, the drop rebounds laterally toward the lower hydrophobic side. Because the high hydrophobic side exerts the stronger unbalanced Young’s force on the contact line compared with the low hydrophobic side, the difference of the forces results in the asymmetrical rebound. A phase diagram displays the rebound numbers of a drop impacting on the various chemically homogeneous and heterogeneous surfaces. A simply quantitative estimation is made to predict th rebound heights and flying times through the contact angles of the surface. This work promotes the understanding of the rebound mechanism of a drop impacting on a chemically heterogeneous surface and provides a guiding strategy for the precise control of the lateral behavior of rebounding drops by hydrophobic and heterogeneous surfaces.