To improve the thermal and hydraulic performance of symmetric wavy microchannel heat sinks, a novel design has been devised with slanted secondary channels from trough to crest based on its pressure distribution characteristics. These channels connect regions of adverse pressure gradient in any two neighboring channels to form a novel microchannel heat sink (SW-TC). Employing three-dimensional numerical simulations, a comparative analysis was performed on the flow and heat transfer characteristics among the SW-TC, the symmetric wavy microchannel with wave crest-to-crest secondary flow channels (SW-CC), and the symmetric wavy microchannel with wave trough-to-trough secondary channels (SW-TT). The results indicate that the design of slanted secondary channels significantly improves fluid mixing across channels, suppresses boundary layer development, and consequently enhances the heat transfer efficiency and overall performance of the SW-TC. The SW-TC achieves its peak relative Nusselt number and overall performance factor at 1.835 and 1.843, respectively. Furthermore, the SW-TC exhibits excellent temperature uniformity across the heating wall, and its temperature increase along the flow direction is a mere 8.3 K at Re = 200. It also presents the lowest entropy generation number among all designs, reaching 0.56 at Re = 100.

中文翻译：

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对称波浪形微通道散热器中传热和流体流动的数值研究，由倾斜的二次通道加固


为了提高对称波浪形微通道散热器的热力和水力性能，根据其压力分布特性，设计了一种新颖的设计，即从槽到波峰的倾斜次级通道。这些通道连接任意两个相邻通道中的不利压力梯度区域，形成新型微通道散热器 （SW-TC）。采用三维数值模拟，对 SW-TC、具有波峰到波峰次级流道的对称波浪形微通道 （SW-CC） 和具有波谷到波谷次级通道 （SW-TT） 的对称波浪形微通道之间的流动和传热特性进行了比较分析。结果表明，倾斜次级通道的设计显著改善了通道间的流体混合，抑制了边界层的形成，从而提高了 SW-TC 的传热效率和整体性能。SW-TC 的相对努塞尔数和整体性能因子分别在 1.835 和 1.843 处达到其峰值。此外，SW-TC 在整个加热壁上表现出优异的温度均匀性，当 Re = 200 时，其沿流动方向的温度升高仅为 8.3 K。在所有设计中，它的熵生成数也是最低的，在 Re = 100 时达到 0.56。