並列タイトル等Direct observation of Piston Effect in a critical fluid
タイトル（掲載誌）宇宙航空研究開発機構研究開発資料: 平成15年度総合技術研究本部宇宙領域研究成果報告書:先行研究等 = JAXA Research and Development Memorandum: FY15 Annual Report of Research & Development on Space Technology in the Institute of Space Technology and Aeronautics: Advanced Technology
一般注記Thermal energy applied to a pure material near its critical point immediately makes a strong expansion. This causes an adiabatic compression in the front of the expansion and a large density difference is formed there. The difference with adiabatic energy is transported as an acoustic wave. This rapid heat transportation is called Piston Effect. In the present study, an ultra-sensitive and high-speed density measurement system was developed to observe the elementary process of Piston Effect. To demonstrate the performance of the system, the measurement of sound velocity in a critical fluid was conducted. Numerical simulations were also made to confirm the experimental results. Using the FFT method to both of the experiment and the simulation, the sound velocity could be precisely evaluated. The velocity profile versus temperature from the experimental results shows a good agreement with the simulation results and theoretical prediction, that is, the velocity rapidly decreases as the fluid approaches its critical point. This indicates that the present experiments and simulations complementally enable quantitative discussion of the critical phenomena.
資料番号: AA0048129026
レポート番号: JAXA-RM-04-011
一次資料へのリンクURLhttps://jaxa.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2690&item_no=1&attribute_id=31&file_no=1
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
提供元機関・データベース宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ