翅片管式换热器空气侧流动及换热性能的数值模拟

借助CFD软件对3种不同类型的翅片管式换热器(平直翅片、均匀波纹翅片和倾角渐增波纹翅片)的流动传热性能进行了三维数值模拟计算,得出了在不同入口风速下各流域中心面的温度场、压力场和速度场分布图,计算出各翅片表面在不同风速下的平均传热系数和阻力系数,并与相关实验数据对比,证明该数值模拟的正确性.研究结果表明,倾角渐增波纹翅片的平均努谢尔数比平直翅片的高13.8%~29.3%,比均匀波纹翅片的高5.5%~10.3%,其强化传热效果显著.

Numerical Simulation of Heat Transfer and Fluid Flow in Fin and Tube Heat Exchanger on the Air Side

The performance of flow and heat transfer of three kinds of fin and tube heat exchangers including plane fin, average pitch wave-fin and increasing pitch wave-fin heat exchangers were numerically simulated with CFD software, and the distributions of temperature, pressure and velocity on each central plane of fluid region were obtained.In addition, the mean surface heat transfer coefficient and resistance coefficient of fin were measured under different wind velocity.The numerical results were proved to be correct by the available experimental data.The study indicates that Nu number of the increasing pitch wave-fin is 13.8%~29.3% higher than the plane fin, and 5.5%~10.3% higher than the average pitch wave-fin, thus achieving remarkable heat transfer enhancement.