Dynamic Behavior of Impacting Droplet on the Edges of Different Wettability Surface

IF 3.7 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2024-09-25 DOI:10.1021/acs.langmuir.4c02253

Lei Xing, Shuai Guan, Minghu Jiang, Lixin Zhao, Xinya Li

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Abstract

The dynamic behavior of impacting droplet shearing by the surface edge with different wettabilities is complicated and has great significance for engineering application. The morphological evolution of droplet with various Weber numbers (We) and wettability impacting on the edge of square substrate is investigated by high-speed photography. Moreover, the effects of the contact angle (α) and Weber numbers (We) on the shear breaking process of droplets are obtained. There are three types morphological evolution of impacting droplet are observed experimentally, including unbroken, tensile breakup, and shear breakup. Contact angle and Weber number have been proved to be the significant factors affecting the type of droplet morphological evolution. Meanwhile, the critical Weber number of different types are obtained quantitatively. Moreover, as α increases, the critical Weber numbers for breakup increase. In the shear breakup process, the mass ratio between the droplets remaining on the substrate and the initial droplets is maintained at 50%. Particularly, a reliable prediction model for the spreading of droplet impacting the side wall is proposed and compared with the experimental data. Overall, this study provides new direction and guidance for exploring droplet breakup kinetics.

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不同润湿性表面边缘上撞击液滴的动态行为

不同润湿性的液滴撞击表面边缘发生剪切的动态行为非常复杂，对工程应用具有重要意义。本文通过高速摄影研究了不同韦伯数（We）和润湿性的液滴撞击方形基底边缘时的形态演变。此外，还得到了接触角（α）和韦伯数（We）对液滴剪切破碎过程的影响。实验观察到撞击液滴的形态演变有三种类型，包括未破裂、拉伸破裂和剪切破裂。实验证明，接触角和韦伯数是影响液滴形态演变类型的重要因素。同时，定量得出了不同类型的临界韦伯数。此外，随着 α 的增大，破裂的临界韦伯数也随之增大。在剪切破裂过程中，残留在基底上的液滴与初始液滴的质量比保持在 50%。特别是提出了液滴撞击侧壁扩散的可靠预测模型，并与实验数据进行了比较。总之，这项研究为探索液滴破裂动力学提供了新的方向和指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).