Dissipation of oscillatory contact lines using resonant mode scanning
Dissipation of oscillatory contact lines using resonant mode scanning
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DOI：
10.1038/s41526-019-0093-0
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发表时间：
2020-01-21
期刊：
影响因子：
5.1
通讯作者：
Steen, Paul H.
中科院分区：
文献类型：
--
作者：
Xia, Yi;Steen, Paul H.
移动接触线（CL）消散。固着液滴，机械驱动到共振的接触基板的平面正常迫使，可以表现出振荡CL运动与CL损失占主导地位的散装耗散。常规实践基于CL处的不平衡杨氏力的机械功的速率来测量CL耗散。典型的方法需要测量CL的局部值和关于“平衡”接触角（CA）的假设。本文演示了如何使用强迫频率的扫描来表征CL耗散，而不依赖于CL附近的测量。这些结果与国际空间站（ISS）的实验直接相关，并与地球上的润湿性应用具有长期相关性。这里报道的实验使用各种浓度的水-甘油混合物在低滞后非润湿基材上。
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.