超临界二氧化碳在水平螺旋槽管和光管管内传热特性的数值模拟  

Numerical Simulation of Heat Transfer Characteristics of Supercritical Carbon Dioxide in Horizontal Spirally Fluted Tube and Smooth Tube

作　　者：邱晗 陶乐仁[1,2] 李猛 林智博 QIU Han;TAO Leren;LI Meng;LIN Zhibo(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer for Power Engineering,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海市动力工程多相流动与传热重点实验室,上海200093

出　　处：《制冷技术》2022年第4期8-14,共7页Chinese Journal of Refrigeration Technology

基　　金：上海市动力工程多相流动与传热重点实验室基金(No.1N-15-301-101)。

摘　　要：本文采用RNG k-ε湍流模型(RNG为一种重整化群的数学方法)对超临界二氧化碳流体在主管内径为22.12 mm、长度为960 mm的螺旋槽管内的冷却换热进行了数值模拟,研究了入口雷诺数,入口压力和有无浮升力对管内流动传热的影响,并和水平光管内的冷却换热进行了对比。结果表明,当入口雷诺数相同时,入口压力为8、9和10 MPa下螺旋槽管的平均传热系数分别比光管高24.64%、28.75%、25.56%;在入口压力相同,入口雷诺数分别为35000、45000、55000下螺旋槽管的湍动能分别比光管高4.4%、18.5%和16.0%;在螺旋槽管和光管中有浮升力的传热系数大于无浮升力情况下的传热系数,且相比光管,浮升力对螺旋槽管具有更大的影响。The cooling heat transfer of supercritical carbon dioxide fluid in a spirally fluted tube with an inner diameter of 22.12mm and a length of 960 mm is simulated by using the RNG k-εturbulence model.RNG is a mathematical method for renormalizing groups.The effects of inlet Reynolds number,inlet pressure and the presence of buoyant lift force on the flow heat transfer in the tube are studied.The cooling heat transfer in a horizontal smooth tube is compared with that in a horizontal smooth tube.The results show that when the inlet Reynolds number is the same,the average heat transfer coefficient of spirally fluted tube under inlet pressure of 8MPa,9MPa and 10MPa is 24.64%,28.75%and 25.56%higher than that of light pipe,respectively.When the inlet pressure is the same and the inlet Reynolds number is 35000,45000 and 55000,the turbulent kinetic energy of spirally fluted tube is 4.4%,18.5%and 16.0%higher than that of light pipe,respectively.The heat transfer coefficient with buoyancy in the spiral grooved tube and the smooth tube is greater than that without buoyancy,and compared with the smooth tube,the buoyancy has a greater influence on the spirally fluted tube.

关 键 词：超临界二氧化碳 数值模拟 螺旋槽管 冷却换热 

分 类 号：TB611[一般工业技术—制冷工程] TP391.9[自动化与计算机技术—计算机应用技术]