Development of a thermodynamic model for a cold cycle 3He-4He dilution refrigerator |
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| Affiliation: | 1. Sumitomo Heavy Industries, Ltd., 5-2 Soubiraki-cho, Niihama, Ehime 792-8588, Japan;2. Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan;3. Faculty of Mathematics and Physics, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;4. Aerospace Research and Development Directorate, JAXA, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan;5. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;1. CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay, France;2. Univ Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622 Villeurbanne, France;3. Massachussets Institute of Technology, Laboratory for Nuclear Science, 77 Massachusetts Avenue Cambridge, MA 02139-4307, USA;1. Department of Mechanical Engineering, University of Wisconsin – Madison, 1500 Engineering Drive, ERB – Room 1335, Madison, WI 53706, USA;2. Department of Mechanical Engineering, University of Wisconsin – Madison, 1500 Engineering Drive, ERB – Room 1341, Madison, WI 53706, USA |
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| Abstract: | A thermodynamic model of a 3He-4He cold cycle dilution refrigerator with no actively-driven mechanical components is developed and investigated. The refrigerator employs a reversible superfluid magnetic pump, passive check valves, a phase separation chamber, and a series of recuperative heat exchangers to continuously circulate 3He-4He and maintain a 3He concentration gradient across the mixing chamber. The model predicts cooling power and mixing chamber temperature for a range of design and operating parameters, allowing an evaluation of feasibility for potential 3He-4He cold cycle dilution refrigerator prototype designs. Model simulations for a prototype refrigerator design are presented. |
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| Keywords: | Dilution refrigerator Reversible superfluid magnetic pump |
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