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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer enhancement of X-lattice-cored sandwich panels by introducing pin fins, dimples or protrusions
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Heat transfer enhancement of X-lattice-cored sandwich panels by introducing pin fins, dimples or protrusions

机译：通过引入销翅片，凹坑或突起来传热X-rattice-Cored夹层板的热传递增强

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摘要

The special topology of the X-lattice induces a large-scale primary spiral flow and three kinds of secondary flow skewed towards and away from the endwall regions and behind each ligament. To make full use of secondary flows produced in different regions, dimples, protrusions and pin fins are separately introduced to the endwall of a sandwich panel to further improve the overall cooling performance. Forced air convection in the six sandwich panels is numerically investigated based on a validation of the numerical model against experimental data available in the literature. Results reveal that the case with pin fins installed in the region upstream of the crosses in the X-lattice (Region A) exhibits the best overall heat transfer performance, while the case with dimples installed downstream of the crosses in the X-lattice (Region B) shows the poorest heat transfer. In terms of the pressure drop, the introduction of protrusions or pin fins in Region A slightly decreases the pressure drop within a certain range of Reynolds number, but the other four cases show an increase in pressure drop. Taking the pressure drop and heat transfer into consideration, a proper combination of the X-lattice and the elements can enhance the overall thermal performance of the sandwich panel. The modifications of the fluid flow and local heat transfer characteristics by the added elements are well analyzed to understand the underlying mechanisms. (C) 2019 Elsevier Ltd. All rights reserved.
机译：X-晶片的特殊拓扑引起大规模的主要螺旋流动，以及三种次流动朝向和远离端壁区域和每个韧带后面。为了充分利用在不同区域中产生的二次流动，将凹槽，突起和销翅片单独引入夹层板的端壁以进一步提高整体冷却性能。基于对文献中可用的实验数据的数值模型的验证进行了数值研究了六个三明治面板中的强制空气对流。结果表明，安装在X-·格子（区域A）的十字架上游的区域中的销钉表现出最佳的整体传热性能，而凹坑在X-晶格中安装过杂交的情况（区域b）显示最糟糕的传热。就压降而言，区域突起或尖翅片的引入略微降低了雷诺数的一定范围内的压降，但另外四个情况显示增加压降。考虑压力下降和传热，X晶格的适当组合和元件可以提高夹层面板的总热性能。通过添加元件的液体流动和局部传热特性的修改得到很好地分析以了解潜在的机制。 （c）2019 Elsevier Ltd.保留所有权利。

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