低翅片管换热过程的数值模拟及其结果分析

以用于冷凝器中的低翅片管为研究对象，利用ANSYS中的流体传热分析模块FLOTRAN CFD，建立管内通R22制冷剂，管外通空气的翅片管换热过程的二维模型，并对其进行流固耦合模拟分析.研究采用正交实验的方法，探究了换热过程中流场与温度场的分布状况，并结合传热学、流体学理论对结果进行了分析，研究表明:在等热流的情况下，翅片管的换热性能明显优于光管，在指定范围内，翅片管换热性能随翅片间距的增加而增强，随翅片厚度的增大而减弱，随翅片高度的增大而增强，但管外压降却随翅高的增大而显著变大，综合考虑换热性能与压降，对翅片管的结构参数进行了优化. 

Numerical simulation of heat transfer process for low finned tube and its result analysis

With the low finned tubes used in the condenser as the research object , the two-dimensional model with the refrigerant （R22） flow in tube and the air flow outside tube is established by using the fluid heat transfer analysis module of ANSYS FLOTRAN CFD, and its fluid-structure interaction simulation is analyzed. Orthogonal experiments are performed to study the distribution of the flow field and temperature field for the heat transfer process. The following conclusions are drawn from the analysis with the heat transfer theory and fluerics theory：the heat transfer performance of finned tube is significantly better than that of the light pipe with the same heat flux;the heat transfer performance of finned tube is enhanced with the increase of the fin spacing and fin height and weakened with the increase of fin thickness within the specified range;but the pressure drop outside the tube is significantly weakened with the increase of fin height. The structure parameters of finned tube can be optimized with the overall consideration of the heat transfer performance and pressure drop.