Study of Dynamic Critical Phenomena for TypeIII Hydrogen Fluid Mixtures with Accurate Measurement of their Supercritical Transport Properties

• Project/Area Number: 17K06198
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Kyushu University
• Principal Investigator: Sakoda Naoya 九州大学, 工学研究院, 准教授 (30532337)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2017: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 水素 / 混合物 / 超臨界流体 / 熱物性 / 輸送性質 / 超臨界

Outline of Final Research Achievements

Hydrogen has attracted attention as a next-generation energy carrier, and accurate thermophysical properties of hydrogen mixtures are required. The thermophysical behavior of hydrogen mixtures is very different from that of pure hydrogen. In this study, PVTx property and thermal conductivity measurement apparatuses of hydrogen mixtures were developed, and accurate measurements of hydrogen + carbon dioxide mixtures were performed. In addition, PVTx property and thermal conductivity surfaces including the supercritical region calculated by an equation of state and correlation were discussed.

Academic Significance and Societal Importance of the Research Achievements

水素と炭化水素や二酸化炭素の混合系は，温度－圧力線図上で臨界曲線が不連続かつ高圧域へと発散する特異な系であり，Type IIIとして分類される．このような複雑な系の正確な状態曲面は純物質とは全く異なり，その解明が必要とされている．また水素を含む混合系の物性計測は水素の取扱いや組成の決定が非常に困難である．本研究では，水素混合系のPVTx性質や熱伝導率の精密測定が可能な装置を開発した．本装置を用いて測定されるデータにより，状態曲面の検証が可能となり，水素社会の実現に向けた利用が期待される．また，他の類似した複雑なType混合系についても本知見の応用が可能となる．

Research Products

• [Presentation] A PVT Property Measurement Apparatus for Carbon Dioxide + Noncondensable Gases Mixtures and Observation of Phase Equilibrium Including near the Critical Points (2019)
  • Author(s): Keisuke Abe, Kentaro Toshima, Yutaro Midorikawa, Naoya Sakoda, Yasuyuki Takata, Masamichi Kohno
  • Organizer: The Second Pacific Rim Thermal Engineering Conference (PRETEC2019)
  • Int'l Joint Research