JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

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Other TitleSupercooling limit of levitated water microdroplets by RF-trap method
Author(jpn)水上 一也; 小池 大輔; 水野 章敏; 渡邉 匡人
Author(eng)Mizukami, Kazuya; Koike, Daisuke; Mizuno, Akitoshi; Watanabe, Masahito
Author Affiliation(jpn)学習院大学 理学部 物理学科; 学習院大学 理学部 物理学科; 学習院大学 理学部 物理学科; 学習院大学 理学部 物理学科
Author Affiliation(eng)Gakushuin University Department of Physics, Faculty of Science; Gakushuin University Department of Physics, Faculty of Science; Gakushuin University Department of Physics, Faculty of Science; Gakushuin University Department of Physics, Faculty of Science
Issue Date2005-03
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title宇宙利用シンポジウム 第21回 平成16年度
Space Utilization Research: Proceedings of the Twenty-first Space Utilization Symposium
Start page31
End page34
Publication date2005-03
AbstractThe supercooled water is interesting subject in material science, atmospheric science and life science. Thermo-physical properties of undercooled water show that the maximum undercooling temperature is about - 45 C. However, direct observation of supercooled water at - 45 C has not been succeeded still now. Thus the experimental apparatus for observation of large undercooling of water at near - 45 C has been developed. This apparatus consists of the Radio-Frequency (RF) trap and the cryogenic devices. Using this system, it is possible to levitate micro size water droplet under 0 C. In this experiment, maximum undercooling temperature of water droplet was - 20 C. This temperature was higher than expected value from the results of thermophysical properties measurements. On the basis of the experiment, a new experimental system has been developed to achieve larger undercooling of water droplets. Using this new system, undercooling temperature of about - 45 C will be possible.
Keywordslevitation; maximum undercooling; water; thermophysical property; temperature measurement; electrospray; normalized stability diagram; condensing; thermocouple; 浮遊; 最大過冷却; 水; 熱物性; 温度計測; エレクトロスプレー; 正規化安定ダイアグラム; 凝縮; 熱電対
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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