翅片管熔盐对流传热特性研究  

Heat transfer characteristics of molten salt in finned tube

作　　者：樊奇伟 朱海华[1] 陈玉爽[1] 王纳秀[1,2] 朱志远[1,2,3] 

机构地区：[1]中国科学院上海应用物理研究所嘉定园区,上海201800 [2]中国科学院大学,北京100049 [3]上海科技大学,上海201210

出　　处：《核技术》2017年第7期52-58,共7页Nuclear Techniques

基　　金：中国科学院战略性先导科技专项(No.XD02040100)资助~~

摘　　要：高温熔盐在熔盐堆和太阳能等能源领域有广泛的应用前景。为研究熔盐在强化换热管中的强化传热效果,本文基于三元硝酸盐KNO_3-NaNO_2-NaNO_3(摩尔分数比为53%-40%-7%)与导热油的对流传热实验装置,根据相似理论使用导热油代替熔盐,对翅片换热管湍流区的对流传热特性开展了测量,流体雷诺数(Re)变化范围10 000-60 000。通过威尔逊分离法获得翅片管中湍流区的对流传热系数(ho)和努赛尔数(Nu),基于实验数据与Dittus-Boelter公式,拟合翅片管湍流区的对流传热关联式,实验数据与拟合公式的误差在-7.1%-7.5%之间。与传统对流传热关联式Dittus-Boelter公式对比进行强化传热效果评估,结果表明,翅片管的强化传热效果为光滑管的2.32-3.63倍。Background：High-temperature molten salt has been considered as medium for heat transfer in molten salt reactors and energy storage in solar powerdue to its excellent thermal physical properties. Purpose： This study aims at the heat transfer characteristics of molten saltand the enhanced heat transfer effect in finned tube.Methods：Based on the convective heat transfer experimental apparatus of KNO3-NaNO2-NaNO3 （53%-40%-7%） molten salt and heat transfer oil, the heat transfer characteristics of turbulent region in finned tube was studied.The convective heat transfer characteristics of molten salt in finned tube were analyzed on the basis of experimental data,and a new correlation was proposed by the least squares fitting method. Furthermore, the effect of enhanced heat transfer of finned tube was discussed based on above analysis. Results andConclusion：The error between the experimental data and the fitting formularis in the range of -7.1% and 7.5%. The Dittus-Boelter convective heat transfer correlation is used to evaluate the effect of heat transfer, and it shows that the enhanced convective heat transfer effect of the finned tube is 2.32-3.63 times of that of smooth tube.

关 键 词：对流传热 湍流 翅片管 

分 类 号：TK124[动力工程及工程热物理—工程热物理]