波纹穿圆孔翅片管换热器换热特性的数值模拟

摘要

The air-side flow and heat transfer performance of corrugated fin-and-tube heat exchangers with circular holes were studied by simulation method carried out by FLUENT software. The effects of two factors on corrugated fin-and-tube heat exchangers with circular holes were analyzed:fin pitch(1.6~2.8mm)and fin thickness(0.14~0.26mm). A comparison was made between the variation range of Re from 819 to 5735 and simulation data of corrugated fins. The simulation results showed that the circular holes caused rather great disturbance to the air flow over the fins,and the heat transfer effect was improved. Under the same conditions,the heat exchange amount of the air-side fins with circular holes was about 20.8%more than that of corrugated fins. In addition,the corresponding pressure drop loss only increased by about 11.2%. In the circular-hole-fin heat exchangers,the Nu number increased with the increase of fin pitch and thickness;however,the friction factor always aggrandized with the increase of fin thickness and decreased with the increase of fin pitch.%采用 FLUENT 数值模拟方法，对波纹穿圆孔翅片管换热器空气侧流动和传热特性进行研究，分析出翅片厚度(1.6～2.8,mm)与翅片间距(0.14～0.26,mm)对换热特性的影响，并选择 Re在819到5735变化范围内与波纹翅片的模拟数据相比较．结果表明，穿圆孔对翅片上空气流动产生了较大的扰动作用，增强了换热．在相同条件下，穿圆孔翅片空气侧的换热量比波纹翅片大20.8%,左右，压力降仅增大11.2%,．穿圆孔翅片换热器中，Nu 数随着翅片间距和厚度的增加均会增加，但阻力因子f 随翅片厚度的增加而增加，随翅片间距的增加而减小．