Is contact-line mobility a material parameter?
Is contact-line mobility a material parameter?
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DOI：
10.1038/s41526-022-00190-y
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发表时间：
2022-02-21
期刊：
影响因子：
5.1
通讯作者：
Steen PH
中科院分区：
文献类型：
--
作者：
Ludwicki JM;Kern VR;McCraney J;Bostwick JB;Daniel S;Steen PH
动态润湿现象通常通过将动态接触角θ与接触线速度UCL相关联的本构定律来描述。所谓的戴维斯-霍金模型因其简单性而值得注意，并通过接触线迁移率参数M将θ与UCL联系起来，该参数在历史上一直被用作特定固-液-气系统的拟合参数。Xia & Steen（2018）最近的实验发现导致了对惯性毛细管运动M的首次直接测量。这为预测快速润湿和去湿行为开辟了令人兴奋的可能性，因为M被认为是可以在一种情况下测量并成功应用于另一种情况的材料参数。在这里，我们调查在何种程度上M是一个材料参数，通过实验和数值相结合的研究二进制座滴聚结。实验进行了不同的润湿性能（静态接触角和滞后）的多个表面上的水滴，并与数值模拟，采用戴维斯-霍金条件与流动性M的固定参数，如测量的周期性动态接触角测角器，即没有拟合参数进行比较。侧视图聚结动力学和时间轨迹的投影扫描面积被用来作为度量比较实验与数值模拟。我们的研究结果表明，Davis-Hocking模型与测量的迁移率参数捕捉到的基本聚结动力学和广泛使用的奇石动态接触角模型在许多情况下。这些观察提供了见解，因为流动性确实是一个材料参数。
Dynamic wetting phenomena are typically described by a constitutive law relating the dynamic contact angle θ to contact-line velocity UCL. The so-called Davis–Hocking model is noteworthy for its simplicity and relates θ to UCL through a contact-line mobility parameter M, which has historically been used as a fitting parameter for the particular solid–liquid–gas system. The recent experimental discovery of Xia & Steen (2018) has led to the first direct measurement of M for inertial-capillary motions. This opens up exciting possibilities for anticipating rapid wetting and dewetting behaviors, as M is believed to be a material parameter that can be measured in one context and successfully applied in another. Here, we investigate the extent to which M is a material parameter through a combined experimental and numerical study of binary sessile drop coalescence. Experiments are performed using water droplets on multiple surfaces with varying wetting properties (static contact angle and hysteresis) and compared with numerical simulations that employ the Davis–Hocking condition with the mobility M a fixed parameter, as measured by the cyclically dynamic contact angle goniometer, i.e. no fitting parameter. Side-view coalescence dynamics and time traces of the projected swept areas are used as metrics to compare experiments with numerical simulation. Our results show that the Davis–Hocking model with measured mobility parameter captures the essential coalescence dynamics and outperforms the widely used Kistler dynamic contact angle model in many cases. These observations provide insights in that the mobility is indeed a material parameter.
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