Accurate Measurements of Thermodynamic Properties and Thermodynamic Analysis of a State-of-the-Art Equation of State for Ternary Fluid Mixtures with Hydrogen Extended from Type III Binary Systems

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H02091
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Kyushu University
• Principal Investigator: Sakoda Naoya 九州大学, 工学研究院, 准教授 (30532337)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 水素 / 混合系 / 飽和密度 / PVTx性質 / 熱物性

Outline of Final Research Achievements

Accurate thermodynamic properties of hydrogen mixtures are essential in the hydrogen society. Binary systems of hydrogen + hydrocarbons or carbon dioxide have a discontinuous critical curve that diverges to a high pressure region, and are classified as Type III, whose behavior is far different from that of pure fluids. In this study, a saturated density and PVTx properties of hydrogen mixtures have been accurately measured. The phase boundary behavior of ternary mixtures including hydrogen calculated from an equation of state was discussed.

Free Research Field

熱工学

Academic Significance and Societal Importance of the Research Achievements

これまでの混合系の飽和状態に関する実測値は温度，圧力，組成に限られることが多く，密度情報は十分で無い．水素を含む混合系の場合，正確な組成の決定や密度測定は非常に困難であるが，本研究では重量法を用いた組成の決定や正確な飽和密度測定を確立した．本研究で確立した方法により，水素混合系の正確な熱物性値の取得が可能になる．さらに状態方程式を用いて水素を含む3成分系の相境界線の挙動につて検証しており，今後の水素利用社会において水素混合物の正確な熱的挙動の解明の一助となる．