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/m² 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.

高温下液体的表面张力通常是在非接触环境下使用公认的振荡滴落法测量的。然而，表面张力测量中的技术困难使得很难将振荡滴法应用于空气悬浮（ADL）系统，这是用于低电导率液体的最可靠悬浮技术。在这项研究中，我们开发了一种新颖的水滴反弹方法，该方法可以在ADL系统中用于测量液体的表面张力。首先通过悬浮喷嘴将悬浮的熔融样品滴到惰性基材上。反弹的样品的振动运动表现为在其自由下落期间在微重力条件下的振动，并且仅在l = 2，m = 0的模式下获得了振动。振荡模式的傅立叶变换提供了l = 2，m = 0模式的共振频率，并在知道质量的情况下能够计算样品的表面张力。此外，少于50 ms的短实验持续时间显着降低了样品中表面蒸发的可能性。我们测量的从1354 K到1827 K的金表面张力数据显示标准偏差为13.4 mJ / m²，并与埃格里等人发表的数据一致。在微重力条件下，两个拟合线性方程之间的最大偏差为1.5％。