Thermal performance and fluid flow characteristics of elliptical fin microchannel are numerically investigated by varying fin orientation in the laminar flow region. Six distinctly oriented elliptical fins ranging 0°–12° along channel length are numerically examined for inlet Reynolds number (Re) ranging 174–748. The same is compared with the conventional straight fin microchannel. It is found that continuous straight fin when replaced with a series of short length elliptical fins leads to re-establishment of the thermal boundary layer and results in thinning of boundary layer thickness. By varying the fin angle, fluid is directed from primary channel to secondary channel which finally flows into the primary channel. These secondary flows disrupt the boundary layer and show better fluid mixing in the channel. Among all the orientations considered, elliptical fin oriented at 2° yields better cooling performance ensuing an optimum average Nusselt number enhancement of 116% (7.68–16.64) with a very less pressure penalty (15%). Besides this, the rise in wall temperature is reduced by 25.39% in comparison to straight fin microchannel.

中文翻译：

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椭圆翅片微通道强化传热

通过改变层流区域中的翅片方向，对椭圆翅片微通道的热性能和流体流动特性进行了数值研究。六个方向不同的椭圆翅片沿通道长度范围为 0°–12°，对范围为 174–748 的入口雷诺数 (Re) 进行了数值检查。与传统的直翅式微通道相比也是如此。发现连续直翅片替换为一系列短长度椭圆翅片时会导致热边界层的重新建立并导致边界层厚度变薄。通过改变翅片角度，流体从主要通道被引导到最终流入主要通道的次要通道。这些二次流破坏了边界层，并在通道中显示出更好的流体混合。在所有考虑的方向中，以 2° 取向的椭圆翅片可产生更好的冷却性能，从而使最佳平均努塞尔数提高 116% (7.68–16.64)，压力损失非常小 (15%)。除此之外，与直翅式微通道相比，壁温升高降低了25.39%。