Hydrogen and Helium Leak Rates from Micromachined Orifices

Lee, I. D.; Smith, Owen; Karagozian, Ann

doi:10.2514/2.1967

Cited by 11 publications

(2 citation statements)

References 9 publications

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“…Experimental data from Jackson [21] Lee et al [22] has shown that defining the conditions of choked flow exclusively by the critical pressure ratio for small orifice sizes may not be sufficient. The work presented by Lee specifically addressed very small openings that are characteristic of leak sizes found in systems containing hydrogen leaks.…”

Section: Appendix a Quantitative Leak Rate Modelsmentioning

confidence: 99%

Management of Leaks in Hydrogen Production, Delivery, and Storage Systems

Rawls¹

2006

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Section: Appendix a Quantitative Leak Rate Modelsmentioning

confidence: 99%

Management of Leaks in Hydrogen Production, Delivery, and Storage Systems

Rawls¹

2006

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“…The development of a fully composite hydrogen storage bottle with a polymer lining is the direction of development of high-pressure hydrogen storage containers today [7,8]. Due to the flammable and explosive nature of hydrogen, many scholars have used small-molecule gases (He) for alternative treatment in the study of hydrogen leakage and have linked helium to hydrogen diffusion in order to convert the two more reliably [9][10][11], so the study of how to improve the smallmolecule gas barrier properties of plastic liners has become a key issue. Some studies have shown that polyethylene has good gas barrier properties and can be used as a plastic liner for hydrogen storage cylinders [12].…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Helium Barrier Performance of Modified Polyamide 6 Lining of IV Hydrogen Storage Tank with Montmorillonite

Zhang

Yang

et al. 2023

Molecules

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In order to investigate the type IV hydrogen storage bottle with better hydrogen storage capacity, the polymer lining of the hydrogen storage bottle was further developed. In this paper, the molecular dynamics method was used to simulate the helium adsorption and diffusion processes within a modified montmorillonite (OMMT)-filled polyamide 6 (PA6) system. The effects of the barrier properties of the composites were investigated at different filler contents (3%, 4%, 5%, 6% and 7%), different temperatures (288 K and 328 K) and different pressures (0.1 MPa, 41.6 MPa, 52 MPa and 60 MPa) for certain contents. It was found that when the filler content was 5%, the permeability coefficient of the material was lower than 2 × 10−13 cm3∙cm/(cm2∙s∙Pa) and the barrier performance was the best. The modified filler with 5% OMMT/PA6 at 328 K still had the strongest barrier performance. When the pressure increased, the permeability coefficient of the modified material first decreased and then increased. In addition to this, the effect of the fractional free volume on the barrier properties of the materials was also investigated. This study provides a basis and reference for the selection and preparation of polymer linings for high-barrier hydrogen storage cylinders.

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