锯齿型翅片单元的流动与传热数值模拟

建立了2种板翅式散热器的锯齿型翅片通道的三维模型,仿真分析了散热器内部不同位置和区域的微观流动机制.通过风洞实验测量了散热器在3种工况下的工作效率.分析结果表明,翅片厚度、热侧通道的数量及高度对散热器的换热和阻力性能具有重要影响，并且雷诺数越大，则影响越显著.当雷诺数增大时，翅片表面换热系数和摩擦系数均增大.在同一雷诺数下，单个翅片的表面换热系数和摩擦系数均沿流向降低.计算与实验结果表明，采用计算流体力学（CFD）模拟分析方法，通过建立合适的模型及网格，不仅有助于了解散热器内部工作状况，而且能够获得有效的性能数据.

Numerical simulation of slit fin cell's flow and heat transfer

Two 3-D models of slit fins on the air side of plate-fin radiator were established.Computational fluid dynamics(CFD) simulation was applied to analyze the flow mechanism and heat transfer characteristic at different areas in air channels.Wind tunnel tests were carried out to determine the performance of the radiator under three working conditions,and the measured results were compared with the simulation results.Analysis shows that the fin thickness,and the number and height of hot side channels have important influence on the heat transfer and flow performance.When the Re number increases,the influence is more significant.Both the fin surface heat transfer coefficient and the skin friction coefficient increase with the increasing Re,and they decreases along the flow direction in a single fin.The computation and experimental results indicate that CFD simulation can not only help to study the inside state of the heat exchanger,but also obtain effective performance data.