Time-Resolved Measurements of Interfacial Tension and Flow Speed of the Inclined Water Surface around a Self-propelled Camphor Boat by the Quasi-elastic Laser Scattering Method,The Journal of Physical Chemistry B

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Time-Resolved Measurements of Interfacial Tension and Flow Speed of the Inclined Water Surface around a Self-propelled Camphor Boat by the Quasi-elastic Laser Scattering Method
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2023-03-15 , DOI: 10.1021/acs.jpcb.3c00466
Tomonori Nomoto ₁ , Mizuki Marumo ₁ , Luca Chiari ₁ , Taro Toyota ₂ , Masanori Fujinami ₁

Affiliation

An inclined liquid surface, such as a meniscus, plays an important role in advection and transport phenomena at a liquid’s surface. However, there is no time-resolved measurement method for the interfacial tension of an inclined liquid–air interface. Here, a noninvasive method for simultaneous measurements of the interfacial tension and surface flow speed for an inclined water surface is described. This is an upgrade of the quasi-elastic laser scattering method with a closed-loop control system that introduces the dynamically tracked scattered and referential light into the detector. For the evaluation of the tilt compensation by dynamic tracking, the relationship between the apparent interfacial tension and surface inclination was examined for a water meniscus at 0–5° inclinations. It was also demonstrated that simultaneous measurements of the interfacial tension and surface flow speed around a self-propelled camphor boat on a pure water surface inclined by >3° at the back end of the boat are difficult to conduct accurately without dynamic tracking. Both the interfacial tension difference and the backward flow speed increased as the boat speed increased to 0.1 m/s; that had not been evaluated to date because of the high velocity of the boat and the surface inclination of the water around it. The direct experimental evaluation of the interfacial tension and the flow speed supported the model that the driving force of the camphor boat is the interfacial tension difference and the resistance force proportional to the boat velocity reduces its acceleration.

中文翻译：

用准弹性激光散射法时间分辨测量自航樟脑船周围倾斜水面的界面张力和流速

倾斜的液体表面，例如弯液面，在液体表面的平流和传输现象中起着重要作用。然而，对于倾斜的液-气界面的界面张力，还没有时间分辨的测量方法。在这里，描述了一种用于同时测量倾斜水面的界面张力和表面流速的非侵入性方法。这是准弹性激光散射方法的升级，具有闭环控制系统，可将动态跟踪的散射光和参考光引入探测器。为了通过动态跟踪评估倾斜补偿，研究了倾角为 0-5° 的水弯液面的表观界面张力与表面倾角之间的关系。还证明了在船后端倾斜 > 3° 的纯水表面上同时测量自航樟脑船周围的界面张力和表面流速在没有动态跟踪的情况下很难准确进行。随着船速增加到0.1 m/s，界面张力差和逆流速度均增加；由于船的高速和周围水面的倾斜度，迄今为止尚未对其进行评估。界面张力和流速的直接实验评估支持樟脑船的驱动力是界面张力差和与船速成正比的阻力降低其加速度的模型。

更新日期：2023-03-15

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