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Other TitleDirect observation of the elementary processes of the piston effect in a fluid near its critical point
Author(jpn)吉原 正一; 大西 充; 桜井 誠人; 三浦 裕一; 小林 礼人; 竹之内 武義; 石川 正道; 河合 潤; 本多 克也; 松本 昌昭
Author(eng)Yoshihara, Shoichi; Onishi, Mitsuru; Sakurai, Masato; Miura, Yuichi; Kobayashi, Hiroto; Takenouchi, Takeyoshi; Ishikawa, Masamichi; Kawai, Jun; Honda, Katsuya; Matsumoto, Masaaki
Author Affiliation(jpn)宇宙航空研究開発機構 総合技術研究本部; 宇宙航空研究開発機構 総合技術研究本部; 宇宙航空研究開発機構 総合技術研究本部; 名古屋大学 大学院理学研究科; 中部大学 工学部 理学教室; 高純度化学研究所; 東京工業大学 大学院総合理工学研究科; 三菱総合研究所; 三菱総合研究所; 三菱総合研究所
Author Affiliation(eng)Japan Aerospace Exploration Agency Institute of Aerospace Technology; Japan Aerospace Exploration Agency Institute of Aerospace Technology; Japan Aerospace Exploration Agency Institute of Aerospace Technology; Nagoya University Graduate School of Science; Chubu University Department of Natural Science and Mathematics, College of Engineering; Kojundo Chemical Laboratory Co. Ltd.; Tokyo Institute of Technology Interdisciplinary Graduate School of Science and Engineering; Mitsubishi Research Institute Inc.; Mitsubishi Research Institute Inc.; Mitsubishi Research Institute Inc.
Issue Date2005-10-31
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication date2005-10-31
AbstractThermal energy applied to a pure fluid near its critical point immediately induces a strong expansion. This causes an adiabatic compression and a large density difference at the expansion front. The difference in energy is transported as an acoustic wave. This rapid heat transportation is called the 'piston effect'. In our study, an ultra-sensitive and high-speed density measurement system was developed to conduct a quantitative measurement of the piston effect. Using the system, we made direct observations of the elementary processes of the piston effect. To demonstrate the performance of the system, the sound velocity in a critical fluid was measured. Applying FFT to the experimental results allowed precise evaluation of the sound velocity. The experimental velocity versus temperature profile agreed well with simulation and theoretical prediction, that is, the profile should have scale universality. However, the profile from the experimental results obeys another scale universality if T-T(sub c) is less than 0.1 K. This indicates that our experimental system enables us to quantitatively discuss the critical phenomena.
DescriptionJAXA Research and Development Report
Keywordscritical point; piston effect; temperature control; pulse heating; adiabatic condition; thermal energy; high-speed density measurement; heat transportation; temperature measurement; acoustic velocity; interferometer; direct observation; 臨界点; ピストン効果; 温度制御; パルス加熱; 断熱条件; 熱エネルギー; 高速密度測定; 熱輸送; 温度計測; 音速; 干渉計; 直接観察
Document TypeTechnical Report
JAXA Category研究開発報告
Report NoJAXA-RR-05-006

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