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首页> 外文期刊>International Journal of Heat and Mass Transfer >Investigating the effect of element shape of the face-centered cubic lattice structure on the flow and endwall heat transfer characteristics in a rectangular channel
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Investigating the effect of element shape of the face-centered cubic lattice structure on the flow and endwall heat transfer characteristics in a rectangular channel

机译：对矩形通道中的面向中心立方格晶格结构元素形状对矩形通道流动和端壁传热特性的影响

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摘要

Experimental and numerical methods were utilized to investigate the effect of element shape of the face-centered cubic (FCC) lattice structure on the flow and endwall heat transfer characteristics in a rectangular channel. The porosity of the FCC lattice structure is identical (0.92), while the three different element shapes are circular, rectangular and elliptical. The results reveal that, due to the existence of cross-tilted ligaments of the FCC lattice, more fluid flows towards the endwall region, and periodic acceleration and deceleration of the fluid occur in the free flow passage, which induces an alternation of heat transfer enhancement and weakening. Meanwhile, the peak of heat transfer appears around the second row of vertices, and the averaged heat transfer enhancement produced by FCC lattices is, at least, 3 times higher than that of a smooth channel. The heat transfer performance of the elliptical FCC lattice and the rectangular FCC lattice is respectively 27%-31% and 25%-26% higher than that of the circular FCC lattice at the same Reynolds number, which is due to the larger cross-section size of their ligaments in the flow direction. Considering the trade-offs between heat transfer and pressure drop, the circular FCC lattice exhibits the highest overall heat transfer efficiency.
机译：实验和数值方法用于研究矩形立方（FCC）晶格结构对矩形通道中的流动和端壁传热特性的元素形状的影响。 FCC晶格结构的孔隙率相同（0.92），而三种不同的元件形状是圆形，矩形和椭圆形的。结果表明，由于FCC晶格的交叉倾斜韧带的存在，更多的流体朝向端壁区域流动，并且流体的周期性加速度和减速度发生在自由流动通道中，这诱导传热增强的交替和削弱。同时，传热峰值出现在第二行顶带周围，并且由FCC格子产生的平均传热增强至少比平滑通道高3倍。椭圆形FCC晶格和矩形FCC晶格的传热性能分别比相同雷诺数的圆形FCC格子高出27％-31％和25％-26％，这是由于横截面较大他们的韧带的大小在流动方向。考虑到传热和压降之间的权衡，圆形FCC晶格表现出最高的总传热效率。

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