TED-AJ03-277 EXAMINING A CAPILLARY HEAT EXCHANGER FOR A PULSE TUBE REFRIGERATOR
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概要
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In the present work, possibility of developing a capillary tube heat exchanger for pulse tube refrigerators was examined. Using nitrogen as the working fluid of the refrigerator, we examined experimentally cooling power and temperature distribution within the capillary tube heat exchanger. The capillary tubes considered each have the following dimensions : internal diameter 0.8mm, wall thickness 0.6mm and length 200mm. For this configuration of the heat exchanger, gas flow area was only 3.016(mm)^2. Figure 1 shows the photograph of the cold-head of the refrigerator, and U-tubes are the capillary tube heat exchanger, which consists of six capillary tubes. The minimum temperature achieved was limited to about 238K for a pressure wave having 1.3MPa average pressure, 0.3MPa amplitude and 9Hz frequency. Experimental results obtained are as follows. With or without a heating load, there was a temperature difference of 8K end-to-end in the capillary tubes. The maximum heat load on the heat exchanger was 4W, and[figure]with this heat load, the warm-end of the heat exchanger rose to 2℃ at steady-state. Thermoacoustica, a software package based on thermoacoustic theory, was used to seek conditions under which the experimental temperature profiles can be reproduced analytically. Figure 2 shows how the temperature profile in the heat exchanger changes when the input displacement values (X_p, X_s) of Thermoacousitca were changed; where X_p and X_s are progressive and standing wave components of displacement. There was a close relationship between the temperature profile of the heat exchanger and average mass flow through it; when the average mass flow rate decreased the temperature profile became curved. The mass flow rates were shown to be realistic values in that the compressor used can supply such flow rates. These results indicate that Thermoacoustica can be used to analyze the feasibility of a system design of a pulse tube refrigerator having a capillary heat exchanger.[figure]
- 一般社団法人日本機械学会の論文
著者
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Cheng Vincent
School Of Mechanical And Manufacturing Engineering The University Of New South Wales
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CHANDRATILLEKE Rohana
School of Mechanical and Manufacturing Engineering The University of New South Wales
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LEONG Seng
School of Mechanical and Manufacturing Engineering The University of New South Wales
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LEONARDI Eddie
School of Mechanical and Manufacturing Engineering The University of New South Wales