Abstract
This article is dedicated to develop an experimental approach for directly visualizing the global freezing phase change behavior of micro liquid droplets. The infrared (IR) thermograph was proposed to image the basic solidification phenomena of droplet and to acquire its temperature variations during the transient process. In particular, the volumetric recalescence event, regarded as initiation of freezing, was revealed by IR images for the first time. Preliminary results demonstrated that the involved temperature transition due to release of the latent heat can be accurately characterized by evident color break in IR images. Further, experiments were also performed simultaneously on three kinds of droplets made of pure water, dimethylsulfoxide (DMSO) and nano liquid to grasp more precise temporal and spatial temperature distribution. Types of the occurring solidification and the initial frozen volume produced from the recalescence were generally discussed. The IR monitoring method suggests a straightforward way for detecting the freezing phase change activity and its temperature evolution at micro scale.
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This study was partially supported by the Specialized Research Fund for the Doctoral Program of Higher Education, the NSFC, and Tsinghua-Yue-Yuen Medical Sciences Fund.
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Li, F.F., Liu, J. Thermal infrared mapping of the freezing phase change activity of micro liquid droplet. J Therm Anal Calorim 102, 155–162 (2010). https://doi.org/10.1007/s10973-010-0995-2
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DOI: https://doi.org/10.1007/s10973-010-0995-2