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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%。
Using CO2 as the refrigerant, the flow boiling heat transfer characteristics of the low temperature fluid in the microchannels with inner diameters of 0.6 and 1.5 mm were experimentally studied. The experimental results show that when the cryogenic fluid flows through the pipeline under the experimental conditions, Effect of thermal coefficient. The results show that the flow boiling heat transfer model proposed in Ref. [7] has higher prediction accuracy and the error is controlled in the range of 30%, the prediction accuracy of the theoretical heat transfer coefficient before the fluid is dry (experimental data and The ratio of model data is up to 79.8% and the average deviation is up to 21.8%. The theoretical prediction accuracy ratio of the heat transfer coefficient after fluid drying is 18.4% and the average deviation is 59.9%.