椭圆率和管倾角对管翅式换热器热工性能的影响  

Influence of ellipticity and tube inclination angle on thermal performance of tube-fin heat exchanger

作　　者：王周鹏 邓胜祥 WANG Zhoupeng;DENG Shengxiang(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Institute of New Energy and New Energy Saving Technology,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学机械与汽车工程学院能源与动力工程系,上海201620 [2]上海工程技术大学新能源与节能新技术研究所,上海201620

出　　处：《上海工程技术大学学报》2023年第3期233-239,共7页Journal of Shanghai University of Engineering Science

基　　金：国家重点研发计划项目资助(2018YFB0605902)。

摘　　要：建立管翅式换热器模型,在雷诺数Re为500~1600时,对不同椭圆率和管倾角下的管翅式换热器热工性能在3D CFD软件中进行数值分析.分析椭圆率(0.45~0.85)和管倾角(0°~45°)对管翅式换热器的流动和传热特性以及Colburn因子j、摩擦因数f和效率指数j/f的影响.结果表明,j、f随着Re的增大而降低,而j/f随Re的增大而上升,并逐渐趋于平缓;适当地倾斜椭圆管,有利于产生更多的湍流,强化对流换热.当管翅式换热器的椭圆率为0.75,管倾角为15°~25°时,最有利于换热和流体流动特性.The model of tube-fin heat exchanger was established,and thermal performances of tube-fin heat exchanger with different ellipticities and tube inclination angles were analyzed by 3D CFD sfotware when the Re was 500~1600.The effects of ellipticities(0.45~0.85)and tube inclination angles(0o~45o)on flow and heat transfer characteristics,colburn factor j,friction factor f and efficiency index j/f of tube-fin heat exchanger were analyzed.The results show that j and f decrease with the increase of Re,while j/f increase with the increase of Re and tend to be gentle.Proper tilt angle is beneficial to generate more turbulence and strengthen convective heat transfer.When the ellipticity of tube-fin heat exchanger is 0.75 and the inclination angle of the tube between 15o and 25o,the heat transfer and fluid flow characteristics are the most favorable.

关 键 词：椭圆率 管倾角 Colburn因子 摩擦因数 效率指数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]