Novel Method for Surface Tension Measurement: the Drop-Bounce Method
Novel Method for Surface Tension Measurement: the Drop-Bounce Method
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DOI：
10.1007/s12217-021-09883-7
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发表时间：
2021-06-01
影响因子：
1.8
通讯作者：
Ohishi, Yuji
中科院分区：
文献类型：
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作者：
Sun, Yifan;Muta, Hiroaki;Ohishi, Yuji
液体在高温下的表面张力通常是在非接触环境中用成熟的振荡液滴方法测量的。然而，表面张力测量的技术困难使得将振荡液滴法应用于空气动力悬浮(ADL)系统变得困难，ADL系统是最可靠的低电导率液体悬浮技术。在这项研究中，我们开发了一种新的滴弹方法，可以在ADL系统中使用来测量液体的表面张力。悬浮的熔融样品首先通过可拆分的喷嘴落在惰性衬底上。回弹样品在自由落体过程中表现为微重力条件下的振荡运动，只有在L=2，m=0模式下才能获得振荡。振荡模式的傅里叶变换提供了L=2，m=0模式的共振频率，并使在已知样品质量的情况下能够计算其表面张力。此外，小于50ms的短实验持续时间显著降低了样品中表面蒸发的可能性。我们从1354K到1827K测量的金的表面张力数据的标准偏差为13.4mJ/m(2)，与伊吉特等人发表的数据是一致的。在微重力条件下，两个拟合线性方程的最大偏差为1.5%。
The surface tension of liquids at high temperatures is generally measured with the well-established oscillating drop method in a contactless environment. However, technical difficulties in surface tension measurements make it hard to apply the oscillating drop method to the aerodynamic levitation (ADL) system, the most reliable levitation technique for liquids with low electrical conductivity. In this study, we developed a novel drop-bounce method that can be used within an ADL system to measure the surface tension of liquids. A levitated molten sample was first dropped onto an inert substrate through a splittable nozzle. The rebounded sample's oscillatory motion behaved as it would under microgravity conditions during its free-fall, and oscillations were obtained only in the l=2, m=0 mode. Fourier transformation of the oscillation pattern provided resonant frequency of the l=2, m=0 mode and enabled the calculation of the surface tension of the sample under knowledge of its mass. Furthermore, a short experimental duration of less than 50 ms significantly reduced the possibility of surface evaporation in the sample. Our measured surface tension data from 1354 K to 1827 K for gold exhibited a standard deviation of 13.4 mJ/m(2) and were consistent with the data published by Egry et al. under microgravity conditions, with a maximum deviation of 1.5% between the two fitted linear equations.