The thermohydraulic performance of the microchannel heat sinks with three types of double-layered staggered grooves are investigated by numerical simulation. The double-layered staggered grooves are staggered rectangular grooves (SRRG), staggered trapezoidal grooves (STLG) and staggered triangular grooves (STRG), respectively. The effect of the shape and geometrical parameters of the double-layer staggered grooves on the fluid flow and heat transfer characteristics are systematically analyzed by multiple physical fields. The comprehensive performances of the microchannels with SRRG, STLG and STRG are evaluated with help of the total thermal resistance (), / and thermal enhancement factor (). The results show that the Nusselt numbers () of the microchannels with SRRG, STLG and STRG are obviously higher than that of the straight microchannel, and the maximum is about 2.3 times of that of the straight channel. For the SRRG, STLG and STRG, the and friction factor of the SRRG are the lowest, while those of the STRG are the highest. the of the STRG is the lowest while that of the SRRG is highest. The / of the STRG is the lowest and its minimum value is 0.542. The of the STRG is the highest and its maximum value is 1.61. The comprehensive performance of the STRG is the best, followed by STLG and SRRG. It is demonstrated that the double-layer staggered groove structure can enhance effectively heat dissipation.

中文翻译：

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三种双层交错槽微通道散热器的热水性能

通过数值模拟研究了三种双层交错凹槽微通道散热器的热工性能。双层交错凹槽分别为交错矩形凹槽(SRRG)、交错梯形凹槽(STLG)和交错三角形凹槽(STRG)。通过多个物理场系统分析了双层交错沟槽的形状和几何参数对流体流动和传热特性的影响。借助总热阻 ()、/ 和热增强因子 () 来评估具有 SRRG、STLG 和 STRG 的微通道的综合性能。结果表明，SRRG、STLG、STRG微通道的努塞尔数()明显高于直微通道，最大值约为直通道的2.3倍。对于SRRG、STLG和STRG，SRRG的摩擦系数最低，而STRG的摩擦系数最高。 STRG 的 最低，而 SRRG 最高。 STRG 的 / 最低，其最小值为 0.542。 STRG的值最高，其最大值为1.61。 STRG的综合性能最好，其次是STLG和SRRG。实践证明，双层交错凹槽结构可以有效增强散热。