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Characteristics of High-Pressure Hydrogen Jet Dispersion Along a Horizontal Plate.

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Title: Characteristics of High-Pressure Hydrogen Jet Dispersion Along a Horizontal Plate.
Authors: He, Zhonglong1 (AUTHOR), Ba, Qingxin1,2,3 (AUTHOR), Zhang, Jiaxin1,3 (AUTHOR), Yao, Chenyi1,3,4 (AUTHOR), Wang, Yujie1,4 (AUTHOR), Li, Xuefang1,2,3 (AUTHOR) lixf@email.sdu.edu.cn
Source: Energies (19961073). May2025, Vol. 18 Issue 9, p2242. 16p.
Subjects: Computational fluid dynamics, Surface plates, Manufacturing processes, Safety regulations, Safety standards, Nozzles
Abstract: Creating and updating safety regulations and standards for industrial processes and end-uses related to hydrogen demand a solid scientific foundation, which requires extensive research on unignited hydrogen releases from high-pressure systems across different situations. This study focuses on high-pressure hydrogen releases along a horizontal plate to investigate the surface effects on hydrogen dispersion. Hydrogen releases from high-pressure sources up to 30 MPa were modeled using a computational fluid dynamics (CFD) method, with the CFD models validated by experimental data. The hydrogen dispersion characteristics along the plate were studied for various source pressures and leak nozzle diameters. The results show that the maximum flammable extent along the plate increases linearly with both the source pressure and nozzle diameter, while the combustible mass increases to the power of 1.5 with the increase in leakage flow rate. The locations where the jet centerline attach to the plate are identical (about 0.41 m away from the nozzle exit in the axial direction) for different source pressures (10~30 MPa) and nozzle diameters (0.5~1.5 mm). The flow region was divided into pre-attachment and attachment zones by the attachment point, and the self-similarity characteristics of both zones were analyzed. Finally, correlations for the centerline and lateral concentration distributions were developed for both the pre- and post-attachment zones. The results can help users quickly assess safety distance when hydrogen leaks along the plate. [ABSTRACT FROM AUTHOR]
Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 185128177
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PubTypeId: academicJournal
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  Data: Characteristics of High-Pressure Hydrogen Jet Dispersion Along a Horizontal Plate.
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  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. May2025, Vol. 18 Issue 9, p2242. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Computational+fluid+dynamics%22">Computational fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+plates%22">Surface plates</searchLink><br /><searchLink fieldCode="DE" term="%22Manufacturing+processes%22">Manufacturing processes</searchLink><br /><searchLink fieldCode="DE" term="%22Safety+regulations%22">Safety regulations</searchLink><br /><searchLink fieldCode="DE" term="%22Safety+standards%22">Safety standards</searchLink><br /><searchLink fieldCode="DE" term="%22Nozzles%22">Nozzles</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Creating and updating safety regulations and standards for industrial processes and end-uses related to hydrogen demand a solid scientific foundation, which requires extensive research on unignited hydrogen releases from high-pressure systems across different situations. This study focuses on high-pressure hydrogen releases along a horizontal plate to investigate the surface effects on hydrogen dispersion. Hydrogen releases from high-pressure sources up to 30 MPa were modeled using a computational fluid dynamics (CFD) method, with the CFD models validated by experimental data. The hydrogen dispersion characteristics along the plate were studied for various source pressures and leak nozzle diameters. The results show that the maximum flammable extent along the plate increases linearly with both the source pressure and nozzle diameter, while the combustible mass increases to the power of 1.5 with the increase in leakage flow rate. The locations where the jet centerline attach to the plate are identical (about 0.41 m away from the nozzle exit in the axial direction) for different source pressures (10~30 MPa) and nozzle diameters (0.5~1.5 mm). The flow region was divided into pre-attachment and attachment zones by the attachment point, and the self-similarity characteristics of both zones were analyzed. Finally, correlations for the centerline and lateral concentration distributions were developed for both the pre- and post-attachment zones. The results can help users quickly assess safety distance when hydrogen leaks along the plate. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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        PageCount: 16
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      – SubjectFull: Manufacturing processes
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      – SubjectFull: Safety regulations
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      – SubjectFull: Safety standards
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      – SubjectFull: Nozzles
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      – TitleFull: Characteristics of High-Pressure Hydrogen Jet Dispersion Along a Horizontal Plate.
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            NameFull: He, Zhonglong
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            NameFull: Ba, Qingxin
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              M: 05
              Text: May2025
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