کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7045449 | 1457092 | 2018 | 42 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of DC flow on pulse tube cryocooler working at liquid hydrogen and liquid nitrogen temperatures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
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چکیده انگلیسی
The direct current gas flow (DC flow), normally treated as a loss in the pulse tube cryocoolers (PTCs) in the past, has been found may be beneficial to the cooling performance of the PTC working at low temperatures recently. However, the reason why it can improve the cooling performance is still not clear enough. In order to reveal the working mechanism of the DC flow independently, simulation analysis and experiment verification are carried out on a two-stage Stirling type PTC without the double-inlet valve. Results indicate that in the second stage PTC working around 20â¯K, by introducing the DC flow with a positive direction from regenerator side to pulse tube side, the cooling performance will be improved due to the remarkable increase of the AC enthalpy flow in the pulse tube and the decrease of AC enthalpy flow in the regenerator. This is because with the help of positive DC flow, the temperature gradients in the pulse tube and the regenerator of the 20â¯K PTC are improved, i.e. the DC flow causes smaller heat losses in them. Nevertheless, the DC flow has no help on improving the cooling performance of the PTC working around 80â¯K. Simulation and experiment show consistency that with an optimized DC flow, the no-load refrigeration temperature of the second stage Stirling PTC drops 6-7â¯K, and the cooling capacity at 22â¯K increases about 1â¯W.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 137, 5 June 2018, Pages 451-460
Journal: Applied Thermal Engineering - Volume 137, 5 June 2018, Pages 451-460
نویسندگان
Chen Huang, Qiang Cao, Xiaoqin Zhi, Xi Xia, Limin Qiu,