Free-surface flow of liquid oxygen under non-uniform magnetic field |
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| Affiliation: | 1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China;2. Energy Research Institute, Nanyang Technological University, 637141, Singapore;1. Sorbonne Universités, Université Pierre-et-Marie-Curie (Université Paris-6), UMR 7190, Institut Jean-Le-Rond-d''Alembert, 75005 Paris, France;2. CNRS, UMR 7190, Institut Jean-Le-Rond-d''Alembert, 75005, Paris, France;1. Bergen University College, Bergen, Norway;2. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia;1. Depto. de Ingeniería Mecánica, Energética y de los Materiales and Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura, E-06006 Badajoz, Spain;2. Depto. de Mecánica de Fluidos e Ingeniería Aeroespacial, Universidad de Sevilla, E-41092 Sevilla, Spain;1. Department of Electrical Engineering, Graduate school of Engineering, Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo-Ku, Kyoto 615-8510, Japan;2. IMRA MATERIAL R&D Co., Ltd, 2-1 Asahi-Machi, Kariya 448-0032, Japan |
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| Abstract: | The paramagnetic property of oxygen makes it possible to control the two-phase flow at cryogenic temperatures by non-uniform magnetic fields. The free-surface flow of vapor-liquid oxygen in a rectangular channel was numerically studied using the two-dimensional phase field method. The effects of magnetic flux density and inlet velocity on the interface deformation, flow pattern and pressure drop were systematically revealed. The liquid level near the high-magnetic channel center was lifted upward by the inhomogeneous magnetic field. The interface height difference increased almost linearly with the magnetic force. For all inlet velocities, pressure drop under 0.25 T was reduced by 7–9% due to the expanded local cross-sectional area, compared to that without magnetic field. This work demonstrates the effectiveness of employing non-uniform magnetic field to control the free-surface flow of liquid oxygen. This non-contact method may be used for promoting the interface renewal, reducing the flow resistance, and improving the flow uniformity in the cryogenic distillation column, which may provide a potential for enhancing the operating efficiency of cryogenic air separation. |
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| Keywords: | Free-surface flow Magnetic field Paramagnet Liquid oxygen |
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