分形树状通道换热器内流动换热的三维数值模拟

three dimensional model for heat transfer and fluid flow in fractal tree-like channel heat sink was developed. The laminar convective heat transfer in the fractal tree-like channel heat sink with a inlet hydraulic diameter of 4mm was numerically calculated by solid-liquid coupling numerical method. The temperature distribution on heating surface and the significant heat transfer enhancement by the bifurcations were identified and discussed. The results indicated that the secondary flow motion generated at bifurcations can effectively enhance the heat transfer. Fractal tree-like channel heat sink has the considerable advantage over the traditional serpentine flow pattern in both heat transfer and pressure drop. The maximum temperature difference on fractal tree-like channel heating surface is far less than that in serpentine flow pattern under the same inlet Reynolds number. The pressure drop of laminar flow in fractal tree-like channel is only half of that in serpentine channel under the same Reynolds number.