摘要
采用有限体积法商业软件FLUENT,应用SIMPLE算法对某管翅式换热器平直开缝翅片的换热特性进行了数值研究,并提出了多种改进翅片模型.将这些改进模型与原模型在相同仿真条件下进行3D数值对比分析,结果表明：翅片的形状、开缝位置对翅片的总换热量、平均压降和阻力系数等均有影响;在来流速度为5 m/s时,“前疏后密”的双向开缝翅可使传热提高11.8％,压降上升15.7％左右;双耳结构的旋转型翅片在Re=2 400～8 400时,可使传热提高5％～8.28％,压降仅提高0.25％～0.83％,综合性能最佳,为管翅式换热器翅片的设计提供了有益的参考.
The airside performance of a fin-and-tube heat exchanger with flat slotted fin shape is investigated by using a commercial code FLUENT based on the finite volume method implementing SIMPLE algorithm,and a variety of improved fin models are proposed.Three-dimensional numerical results of the improved model and the original model are compared in the same simulation conditions.It is demonstrated that the fin shape and the slotted position have influence on heat transfer rate,average pressure drop and resistance coefficient; two-way slotted fin,which is front sparse and behind intensive,can make the heat transfer rate improve about 11.8％ and the pressure loss rise about 15.7％ when the frontal velocity is 5 m/s; the rotary type of fin with double-ear structure can make heat transfer rate increase by 8.28％ and pressure drop only increase by 0.25％-0.83％ when Re=2 400-8 400,which has the best comprehensive performance,hence provides a beneficial reference for the fin design of the fin-and-tube heat exchanger.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2014年第4期612-617,共6页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家自然科学基金(41276196)资助项目
关键词
管翅式换热器
平直翅片
开缝翅片
传热
数值模拟
fin-and-tub heat exchanger
plate-fin
slit-fin
heat transfer
numerical simulation
