微肋管内R513a流动沸腾换热特性实验研究  

Experimental Investigation on Flow Boiling Heat Transfer Characteristics inside the Micro-fin Tube

作　　者：仇富强 李庆普 Qiu Fuqiang;Li Qingpu(School of electrical engineering,Tongling University,Tongling 244061,China;School of energy and power engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]铜陵学院电气工程学院,安徽铜陵244061 [2]浙江大学能源与动力工程学院,浙江杭州310058

出　　处：《六盘水师范学院学报》2022年第2期104-111,共8页Journal of Liupanshui Normal University

基　　金：铜陵学院人才科研启动基金项目“R417A用于家用空气源热泵热水器热力性能实验研究”(2021tlxyrc25);铜陵学院教学研究项目(重点)“提高工科大学生自主学习教学策略探索与研究——以‘电工电子技术’课程为例”(2021xj004)。

摘　　要：以R513a为研究对象,通过实验研究了质流密度、热流密度、干度、肋片结构等变量对水平管内流动沸腾换热特性的影响,并就实验值与关联式计算值进行了对比,从而确定管内主导换热机制、关联式适用范围,为进一步研究提供实验依据和理论基础。实验结果显示:管内换热系数随质流密度、热流密度的增加而增大,随干度的增加先增大后减小,其临界干度点随质流密度的增大、热流密度的减小而增大;与光管相比,微肋管内换热系数较大,且其临界干度点也较大;在所有关联式中,云(Yun)et at关联式和托姆(Thome)et al关联式的预测精度较好,其平均误差及平均绝对误差均小于30%;于(Yu)et al关联式和卡瓦尔里尼(Cavallini)et al关联式预测值大于实验值,而迪亚尼(Diani)et al关联式和穆罕默德(Mehendale)关联式预测值均小于大部分实验值,质流密度、干度、热流密度等变量对其预测结果影响较大。Taking R513a as the research object,the effects of of mass flux,heat flux,vapor quality and fin structure on the flow boiling heat transfer characteristics inside the horizontal tubes are experimentally studied,and the experimental values are compared with the calculated values of correlation formula for determining the dominant heat transfer mechanism and the application scope of correlation formula in tubes,so as to provide experimental basis and theoretical basis for further research.The experimental results show that the heat transfer coefficient inside the tube increases as the mass flux and heat flux increasing,It is noted that the coefficient increases first and then decreases with increasing vapor quality,and the critical vapor quality increases with the increase of mass flow density and the decrease of heat flow density;The heat transfer coefficient inside the micro-fin tube is larger than that of the smooth tube,and thus the critical vapor quality;Correlations of Yun et at and Thome et al have a better prediction accuracy with the mean deviation and mean absolute deviation of less than 30%among all the correlations;Correlations of Yu et al and Cavallini et al overestimate the heat transfer coefficient while correlations of Diani et al and Mehendale underestimate most of the experimental data inside the tube,and their prediction results are greatly affected by mass flux,vapor quality,heat flux and other variables.

关 键 词：流动沸腾 对流换热 关联式 热流密度 质流密度 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TB64[动力工程及工程热物理—热能工程]