换热器翅片表面空气流动热力过程的数值模拟  

Numerical Simulation of the Thermodynamic Process of Air Flow on Fin Surfaces in Heat Exchangers

作　　者：简弃非[1] 甘庆军[1] 许石嵩[1] 

机构地区：[1]华南理工大学交通学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2004年第9期67-71,共5页Journal of South China University of Technology(Natural Science Edition)

摘　　要：为了减少换热器翅片设计中的盲目性和复杂性 ,利用FLUENT软件模拟了发生在双排 /叉排波纹翅片表面的空气流动和传热过程 .在合理简化物理模型的基础上 ,采用标准k -ε模型和速度 -压力耦合的SIMPLE算法 ,获得了有代表性的翅片表面温度分布、换热系数等值线图 ,以及表面气流速度矢量图和相关计算数据 .分析了翅片入口风速对翅片表面的温度、气流流动、换热系数、换热量及气流阻力的影响 .结果表明 ,增大入口风速有利于提高翅片的换热性能 ,但同时又会增加系统能耗 ,因此入口风速的确定必须考虑系统性能的优化 .In order to reduce the blindness and complexity of designing heat exchanger fins, the air flow and heat transfer process on the surface of double/cross-row corrugated fin were simulated by the software of FLUENT. On the basis of the reasonable predigestion of the physical model of heat transfer and by using the standard k-ε model and the SIMPLE arithmetic of velocity-pressure coupling, some typical contour charts describing the surface temperature distribution and heat exchange coefficient of the fin were obtained, and so were the vector charts of the air velocity on the fin surface and the relevant calculated data. The influence of the air velocity in the inlet on the surface temperature, the air flow, the heat exchange coefficient, the heat exchange quantity and the airflow resistance of the fin was also analyzed. It is concluded that the increasing of the air velocity in the inlet will improve the heat exchange ability of the fin, and increase the energy consumption of the system, which proves the necessity of the optimization of the system performance for setting the air velocity in the inlet.

关 键 词：换热器 翅片 温度场 速度场 换热系数 数值模拟 

分 类 号：TB611[一般工业技术—制冷工程]