Dissipation of oscillatory contact lines using resonant mode scanning.,npj Microgravity

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Dissipation of oscillatory contact lines using resonant mode scanning.
npj Microgravity ( IF 4.4 ) Pub Date : 2020-01-21 , DOI: 10.1038/s41526-019-0093-0
Yi Xia ₁ , Paul H Steen _{1,

2}

Affiliation

Moving contact-lines (CLs) dissipate. Sessile droplets, mechanically driven into resonance by plane-normal forcing of the contacting substrate, can exhibit oscillatory CL motions with CL losses dominating bulk dissipation. Conventional practice measures CL dissipation based on the rate of mechanical work of the unbalanced Young's force at the CL. Typical approaches require measurements local to the CL and assumptions about the "equilibrium" contact angle (CA). This paper demonstrates how to use scanning of forcing frequency to characterize CL dissipation without any dependence on measurements from the vicinity of the CL. The results are of immediate relevance to an International Space Station (ISS) experiment and of longer-term relevance to Earth-based wettability applications. Experiments reported here use various concentrations of a water-glycerol mixture on a low-hysteresis non-wetting substrate.

中文翻译：

使用谐振模式扫描耗散振荡接触线。

移动的接触线（CL）消失了。通过接触基底的平面法向力机械地驱动无数液滴发生共振，这些液滴会表现出振荡的CL运动，其中CL损耗主导着整体耗散。传统做法是根据不平衡杨氏力在CL上的机械功速率来测量CL耗散。典型的方法需要在CL局部进行测量，并需要有关“平衡”接触角（CA）的假设。本文演示了如何使用强制频率扫描来表征CL耗散，而又不依赖于CL附近的测量。这些结果与国际空间站（ISS）的实验具有直接的相关性，而与基于地球的可湿性应用具有更长期的相关性。

更新日期：2020-01-21

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