Molecular Dynamic Simulation of Gas-oscillation Refrigeration Mechanism in a Basic-type Pulse Tube
Pulse-tube refrigerators are widely used in our society today, but research on the microscopic mechanism of the dynamic process of gas flow inside the pulse tube is lacking. In this study, the molecular dynamic simulation method was used to establish a channel model, and the channel was inflated and...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2019-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2019.01.071 |
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| Summary: | Pulse-tube refrigerators are widely used in our society today, but research on the microscopic mechanism of the dynamic process of gas flow inside the pulse tube is lacking. In this study, the molecular dynamic simulation method was used to establish a channel model, and the channel was inflated and deflated to simulate the compression and expansion of a pulse tube. Subsequently, with variations in time, the axial pressure, density, velocity, and temperature of the pulse tube were studied. The results show that the pressure and density gradient in the axial direction of the gas gradually decreased until a balance was reached when the process continued, but a slight reversed gradient occurred. Expansion and compression processes occurred at 64 ps, and the maximum velocities near the channel exit were 775 and 864 m/s, respectively. As the reaction progressed, the maximum velocity gradually moved toward lower pressure. The phases of the pressure and velocity waves in the channel varied with the position. In the compression process, the high temperature of the channel near the closed end reached up to 500 K. Simultaneously, the temperature away from the closed end could be reduced to 223 K, and the expansion process was opposite that in the previous condition. The average time integral at the hot end was 375 K at the time of one temperature cycle superposition, and the average time integral at the cold end was 244 K. Thus, cooling of the environment at the hot and cold ends of refrigeration was facilitated. |
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| ISSN: | 0253-4339 |