臨界点近傍流体のピストン効果の直接観察

Material type: 文書・図像類

Author: 大西, 充ほか

Publisher: 宇宙航空研究開発機構

Publication date: 2006-01-20

Material Format: Digital

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Note (General)：: Thermal energy applied to a pure fluid near its critical point immediately makes a strong expansion. This causes an adiabatic compression in the front...

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Material Type: 文書・図像類
Title: 臨界点近傍流体のピストン効果の直接観察
Author/Editor: 大西, 充
吉原, 正一
桜井, 誠人
Onishi, Mitsuru
Yoshihara, Shoichi
Sakurai, Masato
Author Heading: 大西, 充
吉原, 正一
桜井, 誠人
Onishi, Mitsuru
Yoshihara, Shoichi
Sakurai, Masato
Publication, Distribution, etc.: 宇宙航空研究開発機構
Publication Date: 2006-01-20
Publication Date (W3CDTF): 2006-01-20
Alternative Title: Direct observation of Piston Effect in a critical fluid
Periodical title: 宇宙航空研究開発機構特別資料: 平成16年度総合技術研究本部宇宙領域宇宙科学研究本部合同研究成果報告書:先行研究等 = JAXA Special Publication: FY2004 Report of Joint Research Achievements of the Space Division of Institute of Aerospace Technology and Institute of Space and Astronautical Science: Pioneering Research
No. or year of volume/issue: JAXA-SP-05-011
Volume: JAXA-SP-05-011
Pages: 73-76
ISSN (Periodical Title): ISSN : 1349-113X
Text Language Code: jpn
Subject Heading: 臨界点
ピストン効果
気体膨脹
断熱圧縮
熱伝達
音速
輸送現象
熱拡散
微小重力
自然対流
critical point
piston effect
gas expansion
adiabatic compression
heat transfer
sound velocity
transport phenomenon
thermal diffusion
microgravity
natural convection
Target Audience: 一般
Note (General): Thermal energy applied to a pure fluid 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 our study, an ultra-sensitive and high-speed density measurement system was developed to conduct a quantitative measurement of the 'Piston Effect'. By using the system, we succeeded to directly 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. Using the FFT method to the experimental results, 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 profile should have the scale universality. However, the profile from the experimental results obeys another scale universality if T-T(sub c) is less than 0.1 K. These indicate that our experimental system enables us to quantitatively discuss the critical phenomena.
資料番号: AA0049057017
レポート番号: JAXA-SP-05-011
Access Restrictions: 限定公開
Periodical Title (NCID): AA11984031
https://ci.nii.ac.jp/ncid/AA11984031
Data Provider (Database): 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）
https://irdb.nii.ac.jp
Original Data Provider (Database): 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