Kumar Sanjeev, Medale Marc, Marco Paolo Di, Brutin David
Aix-Marseille Universite, CNRS, IUSTI UMR 7343, Marseille, 13013, France.
DESTEC, University of Pisa, Largo Lazzarino 1, Pisa, 56122, Italy.
NPJ Microgravity. 2020 Dec 11;6(1):37. doi: 10.1038/s41526-020-00128-2.
The evaporation of sessile drops of various volatile and non-volatile liquids, and their internal flow patterns with or without instabilities have been the subject of many investigations. The current experiment is a preparatory one for a space experiment planned to be installed in the European Drawer Rack 2 (EDR-2) of the International Space Station (ISS), to investigate drop evaporation in weightlessness. In this work, we concentrate on preliminary experimental results for the evaporation of hydrofluoroether (HFE-7100) sessile drops in a sounding rocket that has been performed in the frame of the MASER-14 Sounding Rocket Campaign, providing the science team with the opportunity to test the module and perform the experiment in microgravity for six consecutive minutes. The focus is on the evaporation rate, experimentally observed thermo-capillary instabilities, and the de-pinning process. The experimental results provide evidence for the relationship between thermo-capillary instabilities and the measured critical height of the sessile drop interface. There is also evidence of the effects of microgravity and Earth conditions on the sessile drop evaporation rate, and the shape of the sessile drop interface and its influence on the de-pinning process.
各种挥发性和非挥发性液体的固着液滴的蒸发，以及它们在有无不稳定性情况下的内部流动模式，一直是许多研究的主题。当前的实验是一项为计划安装在国际空间站（ISS）欧洲抽屉架2（EDR - 2）上的太空实验做准备的实验，旨在研究失重状态下的液滴蒸发。在这项工作中，我们专注于在MASER - 14探空火箭实验框架内进行的关于氢氟醚（HFE - 7100）固着液滴蒸发的初步实验结果，该实验为科学团队提供了在微重力环境下对模块进行测试并连续六分钟进行实验的机会。重点在于蒸发速率、实验观察到的热毛细不稳定性以及脱钉过程。实验结果为热毛细不稳定性与所测量的固着液滴界面临界高度之间的关系提供了证据。同时也有证据表明微重力和地球条件对固着液滴蒸发速率、固着液滴界面形状及其对脱钉过程的影响。
