Transient temperature and pressure behavior of high-pressure 100 MPa hydrogen during discharge through orifices

Naoya Sakoda, Kiyoaki Onoue, T. Kuroki, K. Shinzato, Masamichi Kohno, M. Monde, Yasuyuki Takata

研究成果: ジャーナルへの寄稿記事

5 引用 (Scopus)

抄録

High-pressure hydrogen at a maximum of 100 MPa in a 1-L-volume vessel is discharged through 0.1-mm- and 0.2-mm-diameter orifices that imitate cracks, and the transient temperature and pressure behavior of the hydrogen in the vessel is presented. The hydrogen at the initial pressure of 100 MPa during its discharge through the ϕ 0.2-mm orifice reaches half of the initial pressure after 16 s, while it takes approximately nine times longer for the ϕ 0.1-mm orifice to reach half of the initial pressure. We theoretically calculate the transient temperature and pressure according to the fundamental equations based on the mass and energy conservations using an accurate equation of state for hydrogen. The actual flow rate through an orifice is generally smaller than the theoretically calculated flow rate because of the contraction flow. Therefore, in this study, we adopt the effective diameters of the orifices instead of the actual diameters, and from comparisons with the experimental pressure, we estimate them to be 0.6 and 0.9 of the actual diameters for the ϕ 0.1-mm and ϕ 0.2-mm orifices, respectively. We use a functional form with a time constant for the heat transfer coefficient to represent the transient temperature behavior, and we describe the time dependence of the heat transfer coefficient. The results show that the calculated temperature and pressure are in good agreement with the experimental values obtained.

元の言語英語
ページ(範囲)17169-17174
ページ数6
ジャーナルInternational Journal of Hydrogen Energy
41
発行部数38
DOI
出版物ステータス出版済み - 10 15 2016

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orifices
Orifices
Hydrogen
hydrogen
Temperature
temperature
heat transfer coefficients
vessels
Heat transfer coefficients
flow velocity
Flow rate
energy conservation
time constant
contraction
time dependence
conservation
Equations of state
equations of state
cracks
Energy conservation

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

これを引用

Transient temperature and pressure behavior of high-pressure 100 MPa hydrogen during discharge through orifices. / Sakoda, Naoya; Onoue, Kiyoaki; Kuroki, T.; Shinzato, K.; Kohno, Masamichi; Monde, M.; Takata, Yasuyuki.

:: International Journal of Hydrogen Energy, 巻 41, 番号 38, 15.10.2016, p. 17169-17174.

研究成果: ジャーナルへの寄稿記事

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AU - Sakoda, Naoya

AU - Onoue, Kiyoaki

AU - Kuroki, T.

AU - Shinzato, K.

AU - Kohno, Masamichi

AU - Monde, M.

AU - Takata, Yasuyuki

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AB - High-pressure hydrogen at a maximum of 100 MPa in a 1-L-volume vessel is discharged through 0.1-mm- and 0.2-mm-diameter orifices that imitate cracks, and the transient temperature and pressure behavior of the hydrogen in the vessel is presented. The hydrogen at the initial pressure of 100 MPa during its discharge through the ϕ 0.2-mm orifice reaches half of the initial pressure after 16 s, while it takes approximately nine times longer for the ϕ 0.1-mm orifice to reach half of the initial pressure. We theoretically calculate the transient temperature and pressure according to the fundamental equations based on the mass and energy conservations using an accurate equation of state for hydrogen. The actual flow rate through an orifice is generally smaller than the theoretically calculated flow rate because of the contraction flow. Therefore, in this study, we adopt the effective diameters of the orifices instead of the actual diameters, and from comparisons with the experimental pressure, we estimate them to be 0.6 and 0.9 of the actual diameters for the ϕ 0.1-mm and ϕ 0.2-mm orifices, respectively. We use a functional form with a time constant for the heat transfer coefficient to represent the transient temperature behavior, and we describe the time dependence of the heat transfer coefficient. The results show that the calculated temperature and pressure are in good agreement with the experimental values obtained.

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