5 mm微肋管内R404A沸腾换热模型的适配性  

Suitability of R404A Boiling Heat Transfer Correlations for 5 mm Microfin Tube

作　　者：何宽 柳建华[1] 余肖霄 冯光东 He Kuan;Liu Jianhua;Yu Xiaoxiao;Feng Guangdong(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,200093,China)

机构地区：[1]上海理工大学能源与动力工程学院

出　　处：《制冷学报》2020年第1期103-111,共9页Journal of Refrigeration

基　　金：上海市部分地方院校能力建设专项计划项目(16060502600)资助~~

摘　　要：本文针对5 mm微肋管内R404A流动沸腾换热进行实验研究,并将研究结果与筛选出的一批换热模型进行适配性验证。实验工况:热流密度5~25 kW/m^2、饱和温度0℃、质量流率200~500 kg/(m^2·s)、干度为0.1~0.9。结果表明:Zhang Xiaoyan等的模型由于工质热物性差异较大,过高的预测了部分数据;Liu Zhongliang等的模型低估了热流密度对传热系数的影响,过低的预测了实验数据;S. M. Kim等的模型不能体现高干度区域传热系数的衰减,整体预测精度不高;K. E. Gungor等的模型能够很好的解释管内传热的过程,同时预测精度较高,平均绝对偏差仅27.46%。乘以修正系数1.372后的模型平均绝对偏差仅为8. 95%,落在30%偏差带上的数据多达98.18%。The flow boiling heat transfer of R404 A in a 5 mm micro-fin tube was studied. A number of flow boiling heat transfer models were selected by comparing the deviation between experimental results and theoretical calculations through a large amount of data to demonstrate the applicability of the models. The experimental conditions were as follows: The heat flux was 5-25 kW/m^2,saturation temperature 0 ℃,mass flow rate 200-500 kg/(m^2·s),and vapor quality 0.1-0.9. The results show that the Zhang Xiaoyan et al.’s model overestimates part of the data because of the great difference of thermophysical properties. Furthermore,the Liu Zhongliang et al.’s model underestimates the influence of the heat flux and underestimates most of the experimental data. The model proposed by S. M. Kim et al cannot reflect the decrease of the heat transfer coefficient in high vapor quality areas and its prediction accuracy is low. K. E. Gungor et al.’s model well explains the process of heat transfer inside a tube with a 27.46% mean absolute deviation;98.18% of the predicted points is within a ±30% range and the mean absolute deviation is 8.95% after multiplied by a modified ratio 1.372.

关 键 词：换热模型 两相流 沸腾 小管径 R404A 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TB611[动力工程及工程热物理—热能工程]