本文针对微针肋顶端间隙诱导产生的加速流对流体流动和传热的影响，采用计算流体力学（CFD）模拟与分析软件进行了三维数值模拟。模型采用有限体积法离散、SIMPLEC算法进行层流计算。模拟结果表明，不同肋端间隙对针肋内部流体流动和传热特性有重要影响。在本文的模拟条件下，定流量和定泵功下的最优无量纲间隙（肋端州隙比肋茸径）分别为O．3，0．5。
The effect of accelerated flow induced by pin tip clearance on fluid flow and heat transfer characteristic was investigated in this paper. Three-dimensional numerical simulation is carried out with adoption of Computational Fluid Dynamic software. The steady, laminar flow and heat transfer equation were solved by using a finite-volume method. Analysis results show that influence of different pin tip clearance on fluid flow and heat transfer was very signifi- cant. In present work, the optimal non-dimensional tip clearance （tip clearance divided by diameter） respectively were 0.3 and 0.5 with the condition of constant flow rate and pumping power consunlption.
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