Parahydrogen–Orthohydrogen Conversion on Catalyst-Loaded Scrim for Vapor-Cooled Shielding of Cryogenic Storage Vessels

Pedrow, Brandt P.; Krishna, Santhosh K. Muniyal; Shoemake, Elijah D.; Leachman, Jacob; Matveev, Konstantin I.

doi:10.2514/1.t5136

Cited by 9 publications

(2 citation statements)

References 9 publications

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“…As this reaction is very slow when unassisted, catalysts placed on the inside walls of vortex tubes can accelerate this conversion. Such vortex tubes can potentially replace conventional Joule-Thomson valves in existing hydrogen liquefaction cycles (Linde-Hampson, Claude) or be used in thermal-shielding systems to reduce hydrogen boil-off [2]. The original and most common application of vortex tubes, also known as Ranque-Hilsch devices, is for temperature separation and refrigeration of atmospheric air at normal temperatures [3].…”

Section: Introductionmentioning

confidence: 99%

Determination of Rate Coefficient for Para-Orthohydrogen Conversion in Cryogenic Vortex Tube

Matveev¹,

Leachman²

2023

World Congress on Momentum, Heat and Mass Transfer

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Raising efficiency of the cooling process for cryogenic hydrogen and minimizing hydrogen boil-off during storage and transportation of liquid hydrogen are critically important factors for widening implementation of hydrogen-based clean energy systems. One novel approach involves utilization of relatively simple catalyzed vortex tubes, where hydrogen in primarily para form is converted into ortho isomer while consuming a significant amount of heat. To design such systems effectively, better understanding is required about catalystassisted para-orthohydrogen conversion rates in high-speed vortical flows. In this study, a computational fluid dynamics simulation has been set up to model an experimental system with cryogenic hydrogen vortex tubes. Mesh-verification and validation study has been conducted first for a non-catalyzed tube. Then, the rate coefficient of the para-ortho conversion of cryogenic hydrogen has been determined by matching numerical results with experimental data available for a catalyzed vortex tube. The presented information can help design and optimize cryogenic hydrogen cooling devices with vortex tubes.

show abstract

Section: Introductionmentioning

confidence: 99%

Determination of Rate Coefficient for Para-Orthohydrogen Conversion in Cryogenic Vortex Tube

Matveev¹,

Leachman²

2023

World Congress on Momentum, Heat and Mass Transfer

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“…Since this reaction is very slow when unassisted, a catalyst needs to be employed to accelerate this conversion for practical applications. Different implementations of this cooling approach have been considered [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Rate of Para-Orthohydrogen Conversion in Cryogenic Vortex Tube

Matveev¹,

Leachman²

2023

JFFHMT

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Raising efficiency of the cooling process for cryogenic hydrogen and minimizing hydrogen boil-off during storage and transportation of liquid hydrogen are critically important factors for widening implementation of hydrogen-based clean energy systems. One novel approach involves utilization of relatively simple catalyzed vortex tubes, where hydrogen in the primarily para-nuclear spin isomer form is converted into the ortho-form while consuming a significant amount of heat. To design such systems effectively, better understanding is required about catalyst-assisted para-orthohydrogen conversion rates in highspeed vortical flows. In this study, a computational fluid dynamics simulation has been set up to model an experimental system with cryogenic hydrogen vortex tubes. Mesh-verification and a validation study has been conducted first for a non-catalyzed tube. Then, the rate coefficient of the para-orthohydrogen conversion of cryogenic hydrogen has been determined by matching numerical results with experimental data available for a catalyzed vortex tube. The presented information can help design and optimize cryogenic hydrogen cooling within vortex tubes.

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Thermoacoustic Flow-Through Cooler for Cryogenic Hydrogen

Matveev

Leachman

2022

Computer Aided Chemical Engineering

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Parahydrogen–Orthohydrogen Conversion on Catalyst-Loaded Scrim for Vapor-Cooled Shielding of Cryogenic Storage Vessels

Cited by 9 publications

References 9 publications

Determination of Rate Coefficient for Para-Orthohydrogen Conversion in Cryogenic Vortex Tube

Determination of Rate Coefficient for Para-Orthohydrogen Conversion in Cryogenic Vortex Tube

Rate of Para-Orthohydrogen Conversion in Cryogenic Vortex Tube

Thermoacoustic Flow-Through Cooler for Cryogenic Hydrogen

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