CFD study on the thermo-physical process in 4 K pulse tube
| Autor: | Kum-Hyok Jong, Myonghua Mun, Kwangson Kim, Chunghyok Chae, Yongrim Kang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry 020209 energy Refrigeration Statistical and Nonlinear Physics 02 engineering and technology Mechanics Cryogenics Computational fluid dynamics 021001 nanoscience & nanotechnology Condensed Matter Physics Pulse (physics) Boundary layer Thermodynamic cycle 0202 electrical engineering electronic engineering information engineering Tube (fluid conveyance) 0210 nano-technology Pulse tube refrigerator business |
| Zdroj: | International Journal of Modern Physics B. 34:2050037 |
| ISSN: | 1793-6578 0217-9792 |
| Popis: | It is of great importance to reveal the refrigeration mechanism at low-temperature around 4 K in pulse tube for improvement of the cooling performance in 4 K pulse tube crycoolers (PTCs). In this paper, the thermo-physical process in 4 K pulse tube was studied analytically from microscopic viewpoint using CFD simulation. The thermodynamic cycles of different gas parcels throughout the pulse tube were investigated. It was found that the real gas characteristics of the helium at the pulse tube cold end manifest more apparently from the central part nearer to the wall outside the boundary layer. Furthermore, it was revealed that boundary layer has the weakened heat loss or helpful effect on refrigeration in phase-shifting 4 K pulse tube operating at low frequency. This research newly provides intensified understanding of the inherent characteristics of 4 K GM-type pulse tube. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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