Abstract
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.
Highlights
Drops have been fascinating researchers for centuries[1,2,3]
It consists of two parts, namely the main evaporating cell (MEC; bottom) and multi-evaporating cells
Our current focus is on the Main evaporating cell (MEC) experiment
Summary
Drops have been fascinating researchers for centuries[1,2,3]. Topics of interest include water falling onto a hot cooking plate, which is a typical example of Leidenfrost drops[1], the evaporation of sessile drops with nanoparticle deposition in coffee rings[4], inkjet printing[5,6], pesticides sprayed onto leaves[7], and blood analysis[8,9]. Sessile drops are simple in geometry, the physics involved in the evaporation process is complex due to the numerous intricate interactions with the substrate and ambient environment, and the fluid nature of the sessile drop itself. An accurate quantitative model of the evaporation process can lead to greater understanding of the evaporation rate and control over the pattern formation or the deposition of particles after the evaporation of a sessile drop. This knowledge can enhance the efficiency of several applications. The physically rich and complex evaporation of sessile drops is of interest to both the academic and industry communities
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