超临界CO_(2)在螺旋槽管式换热器中的冷却换热  

Cooling heat transfer of supercritical CO_(2)in spiral grooved tube heat exchanger

作　　者：王栋[1] 陶银双 鲁月红[1] 陶乐仁[2] Wang Dong;Tao Yinshuang;Lu Yuehong;Tao Leren(School of Civil Engineering and Architecture,Anhui University of Technology,Ma'anshan 243002,China;School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]安徽工业大学建筑工程学院,马鞍山243002 [2]上海理工大学能源与动力工程学院,上海200093

出　　处：《低温与超导》2024年第1期58-64,共7页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51608001);安徽高校自然科学研究重点项目(KJ2017A055)资助。

摘　　要：为了研究超临界CO_(2)(SCO_(2))在螺旋槽管式换热器中的冷却换热特性,采用数值模拟方法对比研究了不同热流密度下,SCO_(2)在不同通道内流动时冷却换热系数和湍流动能。为了更合理地评价各工况下冷却换热的综合性能,从压降和传热系数角度,提出一个综合评价因子EF。研究结果表明:在SCO_(2)进行冷却换热时,其换热系数主要受定压比热容和湍流动能的影响。当SCO_(2)在内管通道内流动时,换热系数低,但压降更小,故综合评价因子EF较大。同时,在所研究工况中,存在最佳热流密度值为-40000 W/m^(2),使EF达到最大值2.00126,此时SCO_(2)冷却换热综合性能最优。In order to study the cooling heat transfer characteristics of SCO_(2)in spiral grooved tube heat exchanger,the cooling heat transfer coefficient and turbulent kinetic energy of SCO_(2)flowing in different channels were studied under the conditions of various density of heat flow rate by numerical simulation method.A comprehensive evaluation factor EFwas proposed from the perspective of pressure drop and heat transfer coefficient to reasonably evaluate the comprehensive performance of flow cooling heat transfer under different working conditions.The results show that the heat transfer coefficient of SCO_(2)is mainly affected by specific heat at constant pressure and the turbulent kinetic energy.When SCO_(2)flows in the inner tube channel,the heat transfer coefficient is low,but the pressure drop is small,so the comprehensive evaluation factor EF is large.At the same time,in the studied working conditions,the optimal density of heat flow rate is-40000 W/m^(2).So that the maximum EF value is 2.00126.At this time,the comprehensive performance of SCO_(2)cooling heat transfer is optimal.

关 键 词：传热 超临界CO_(2) 热流密度 换热系数 数值模拟 

分 类 号：TK123[动力工程及工程热物理—工程热物理]