CO_(2)在微通道制冷器内流动的温降特性研究  

Study on the temperature drop characteristics of CO_(2) flowing in a micro-channel J-T cryocooler

作　　者：燕嘉宁 翁建华 蔡韧 崔晓钰[2] Yan Jianing;Weng Jianhua;Cai Ren;Cui Xiaoyu(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海电力大学能源与机械工程学院,上海200090 [2]上海理工大学能源与动力工程学院,上海200093

出　　处：《低温与超导》2021年第10期70-75,87,共7页Cryogenics and Superconductivity

基　　金：上海市自然科学基金(14ZR149100)资助。

摘　　要：对CO_(2)气体流经多层微通道制冷器的温降特性进行了实验研究。CO_(2)气体的入口压力分别为0.73 MPa和1.1 MPa,入口温度为14℃。实验测得制冷器试件表面冷端最低温度分别为-8.58℃和-40.36℃。入口压力越大,冷端表面温度越低。后选用合适的实验关联式,对CO_(2)气体在微通道制冷器内流动的两种试验工况进行理论分析和计算,得到气体最低冷端温度分别为-14.70℃和-44.10℃。考虑到试件表面与CO_(2)气体之间存在一定的传热温差,与实验结果的比较表明理论分析与计算结果较为合理。The temperature drop characteristics of CO_(2) flowing through multilayer microchannel refrigerators were experimentally studied. The inlet pressures of CO_(2) were set as 0.73 MPa and 1.1 MPa respectively, and the inlet temperature was 14 ℃. The lowest cold end temperatures on the surface of the cryocooler were-8.58 ℃ and-40.36 ℃ respectively. The higher the inlet pressure, the lower the cold end surface temperature. Then, appropriate experimental correlation formula was selected to carry out theoretical analysis and calculation on the two experimental conditions of CO_(2) flowing in the micro-channel refrigerator, and the lowest cold end temperatures of the gas were calculated as-14.70 ℃ and-44.10 ℃ respectively. Considering the heat transfer temperature difference between the cryocooler surface and CO_(2) flow, the comparison with the experimental results shows that the theoretical analysis and calculation results are reasonable.

关 键 词：微通道 回热 焦耳汤姆逊效应 温降特性 CO_(2) 微型制冷器 

分 类 号：TB611[一般工业技术—制冷工程] TB66