圆形开孔翅片管式换热器传热特性的数值模拟

翅片管式换热器是目前气液热交换设备中使用最广泛的一种,它是通过在普通基管上加装翅片来达到强化换热的目的。通过对圆形开孔翅片管空气侧的流动与传热特性进行数值模拟,得到换热器的流场特性,分析在有无扰流孔的情况下翅片管表面的局部换热系数分布规律,并得到扰流孔数、尺寸、位置因素对空气侧传热性能的影响。模拟结果表明：在一定范围内,换热器换热量随着扰流孔数量增加不断增加;随着扰流孔尺寸增大,总换热量呈减少态势;相对来说,扰流孔位置与换热量并无直接关系。

Numerical Simulation of Heat Transfer Characteristics of Circular Openings Finned Tube Heat Exchanger

The finned-tube heat exchanger is one of t he most widely used gas-liquid heat exchange device at present, which through the installation of fins on the common base tube achieves the goal of enhancing heat transfer. Through the numerical simulation of the flow and heat transfer characteristics of circular openings finned tube air side, the heat flow field characteristics are achieved, the partial heat transfer coefficients distribution rule in the case of whether the spoiler fin tube bore surface is analyzed.Furthermore, the influences of the number, size and location on the performance of the air-side heat transfer spoiler holes are get. The results showed that, with the increasing of holes spoiler number, the heat exchange amount also increases in a certain range, and with the increasing of spoiler hole size, the trend of total heat decreases. The position of the spoiler hole has no direct relationship with the heat exchange amount.