Coalescence characteristics of vibrated drops on a wettability gradient surface

IF 2.7 4区材料科学 Q3 CHEMISTRY, PHYSICAL Surface Innovations Pub Date : 2023-05-22 DOI:10.1680/jsuin.23.00012

Feng Chen, Zhi-hai Jia, Yong Deng

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Abstract

The coalescence characteristics of two vibrated droplets at a certain distance on a microstructured surface with gradient wettability are investigated by a high-speed camera in this work. The results show that the volume ratio of the two droplets has a significant effect on the vibration modes. With the change of the volume ratio, the droplet exhibits different vibration modes, such as the pumping mode (PM), the rocking mode (RM), or the pumping-rocking mixed mode (PRM). In addition, the coalescence time of the two droplets varies with the volume ratio. When the volume ratio is close to 1, the two vibrated droplets are in synchronous pumping mode (SPM) and the coalescence time is the shortest. When the volume ratio is far away from 1, the two droplets may show the rocking mode (RM), the asynchronous pumping mode (APM), or the pumping-rocking mixed mode (PRM). At this point, the coalescence time gets increased, especially for the small volume ratios. Finally, the movement characteristics of the three-phase contact lines are discussed, and a theoretical model is proposed to analyze the coalescence process. This work provides a new method to remove droplets rapidly, which is essential to enhance the heat transfer performance of dropwise condensation.

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润湿性梯度表面振动液滴的聚结特性

本文用高速相机研究了在具有梯度润湿性的微结构表面上，两个振动液滴在一定距离处的聚结特性。结果表明，两液滴的体积比对振动模式有显著影响。随着体积比的变化，液滴表现出不同的振动模式，例如泵送模式（PM）、摇摆模式（RM）或泵送-摇摆混合模式（PRM）。此外，两个液滴的聚结时间随体积比而变化。当体积比接近1时，两个振动液滴处于同步泵送模式（SPM），聚结时间最短。当体积比远离1时，两个液滴可能呈现摇摆模式（RM）、异步泵送模式（APM）或泵送-摇摆混合模式（PRM）。在这一点上，聚结时间增加，特别是对于小体积比。最后，讨论了三相接触线的运动特性，并提出了分析其聚结过程的理论模型。这项工作提供了一种快速去除液滴的新方法，这对提高逐滴冷凝的传热性能至关重要。

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

Surface Innovations CHEMISTRY, PHYSICALMATERIALS SCIENCE, COAT-MATERIALS SCIENCE, COATINGS & FILMS

CiteScore

5.80

自引率

22.90%

发文量

期刊介绍： The material innovations on surfaces, combined with understanding and manipulation of physics and chemistry of functional surfaces and coatings, have exploded in the past decade at an incredibly rapid pace. Superhydrophobicity, superhydrophlicity, self-cleaning, self-healing, anti-fouling, anti-bacterial, etc., have become important fundamental topics of surface science research community driven by curiosity of physics, chemistry, and biology of interaction phenomenon at surfaces and their enormous potential in practical applications. Materials having controlled-functionality surfaces and coatings are important to the manufacturing of new products for environmental control, liquid manipulation, nanotechnological advances, biomedical engineering, pharmacy, biotechnology, and many others, and are part of the most promising technological innovations of the twenty-first century.