Journal
MICROGRAVITY SCIENCE AND TECHNOLOGY
Volume 22, Issue 3, Pages 387-395Publisher
SPRINGER
DOI: 10.1007/s12217-010-9200-2
Keywords
Infrared visualization; Sessile drop; Liquid spreading; Capillary forces; Drop evaporation
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Funding
- Centre National d'Etudes Spatiales
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We present in this paper results obtained from a parabolic flight campaign regarding ethanol sessile drop evaporation under reduced gravity conditions. Drops are created using a syringe pump by means of injection through a PTFE (polytetrafluoroethylene) substrate. The drops are recorded using a video camera and an infrared camera to observe the thermal motion inside the drop and on the heating substrate. The experimental set-up presented in this paper enables the simultaneous visualization and access to the heat flux density that is transferred to the drop using a heat flux meter placed between the heating block and the PTFE substrate. We evidence original thermal spreading phenomena during the ethanol drop creation on a heated PTFE substrate. The drop exhibits specific behaviour which is discussed here. This work is performed in the frame of a French-Chinese collaboration (project IMPACHT) for future experiments in a Chinese scientific satellite.
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