Experimental study of the influence of cold heat exchanger geometry on the performance of a co-axial pulse tube cooler |
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| Affiliation: | 1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry of Chinese Academy of Sciences, Zhong Guan Cun Dong Road 29, Hai Dian, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Energy, Materials and Systems, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands;1. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083, China;2. University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China;1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;1. Thales Cryogenics BV, Hooge Zijde 14, 5626 DC Eindhoven, Netherlands;2. Univ. Grenoble Alpes, CEA INAC-SBT, 38000 Grenoble, France;3. Absolut System SAS, 2 rue des murailles, 38170 Seyssinet Pariset, France |
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| Abstract: | Improving the performance of the pulse tube cooler is one of the important objectives of the current studies. Besides the phase shifters and regenerators, heat exchangers also play an important role in determining the system efficiency and cooling capacity. A series of experiments on a 10 W @ 77 K class co-axial type pulse tube cooler with different cold heat exchanger geometries are presented in this paper. The cold heat exchangers are made from a copper block with radial slots, cut through using electrical discharge machining. Different slot widths varying from 0.12 mm to 0.4 mm and different slot numbers varying from around 20–60 are investigated, while the length of cold heat exchangers are kept the same. The cold heat exchanger geometry is classified into three groups, namely, constant heat transfer area, constant porosity and constant slot width. The study reveals that a large channel width of 0.4 mm (about ten times the thermal penetration depth of helium gas at 77 K, 100 Hz and 3.5 MPa) shows poor performance, the other results show complicated interaction effects between slot width and slot number. These systematic comparison experiments provide a useful reference for selecting a cold heat exchanger geometry in a practical cooler. |
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| Keywords: | Cold heat exchanger Co-axial Pulse tube cooler Slot number Slot width |
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