细微通道内低温CO_2流动沸腾换热特性研究  

Study of the Boiling Heat Exchange Characteristics of a Low Temperature CO_2 flow inside a Micro-channel

作　　者：张良[1] 柳建华[1] 叶方平 丁杨[1] 

机构地区：[1]上海理工大学制冷技术研究所,上海200093 [2]浙江新劲空调设备有限公司,浙江龙泉323700

出　　处：《热能动力工程》2014年第3期262-266,341-342,共5页Journal of Engineering for Thermal Energy and Power

摘　　要：用CO2作为制冷剂,对内径为0.6和1.5 mm的细微通道内的低温流体流动沸腾换热特性进行了实验研究,定量分析了实验测试工况下低温流体流经管路时不同工况参数对换热系数的影响。研究表明:参考文献[7]中提出的流动沸腾换热模型具有较高的预测精度,且将误差控制在30%的范围时,流体发生干涸前的换热系数理论预测精度比(实验数据与模型数据之比)可达79.8%,平均偏差可达21.8%;流体发生干涸后的换热系数理论预测精度比为18.4%,平均偏差为59.9%。With CO 2 serving as the refrigeration agent,experimentally studied were the boiling heat exchange characteristics of a low temperature fluid inside a micro-channel having an inner diameter of 0. 6 mm and 1. 5 mm respectively and quantitatively analyzed was the influence of various parameters under various operating conditions on the heat exchange coefficient when the low temperature fluid flows through the pipeline under the test condition. The research results show that the model proposed in the literature[7]has a relatively high prediction precision. When the error was controlled in a range of 30%,the theoretical prediction precision ratio( ratio of the test data and those obtained from the model) of the heat exchange coefficient before the dry-out takes place can be up to 79. 8% and the average deviation can be up to 21. 8% while after the dry-out has taken place,the theoretical prediction precision ratioof the heat exchange coefficient can be up to 18. 4% and the average deviation can be up to 59. 9%.

关 键 词：二氧化碳 换热系数 干涸 流动沸腾换热 

分 类 号：TK121[动力工程及工程热物理—工程热物理]