Abstract Three different heat transfer augmentation techniques namely pin-fins, protrusions and dimples applied to the substrate of a pyramidal sandwich panel are investigated. The flow and heat transfer characteristics of the three modified panels are numerically analyzed and the results are compared with those of the base pyramidal sandwich panel with no surface modification. The heat transfer augmentation techniques applied here change the fluid flow pattern and accelerate the flow adjacent to the substrate leading to higher heat transfer rates compared to the base case. At a fixed Reynolds number, the introduced pin-fins and protrusions enhance the overall Nusselt number by 11.4%–13.3% and 7.2%–7.6%, respectively, while the dimples slightly enhance the overall Nusselt number by 1.8%–3.1% compared to the base pyramidal sandwich panel. All of these surface modification techniques increase the pressure drop. The goodness factor for the four cases are also presented.

中文翻译：

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通过引入针翅/突起/凹坑增强金字塔格子夹层板的热传递

摘要 研究了三种不同的传热增强技术，即应用于金字塔夹芯板基板的针翅、突起和凹坑。对三种改性板的流动和传热特性进行了数值分析，并将结果与​​没有表面改性的基础金字塔夹层板的结果进行了比较。此处应用的传热增强技术改变了流体流动模式，并加速了基板附近的流动，与基本情况相比，导致更高的传热率。在固定的雷诺数下，引入的针翅和突起分别使总体努塞尔数提高了 11.4%–13.3% 和 7.2%–7.6%，而与相比，凹坑使总体努塞尔数略微提高了 1.8%–3.1%。底部金字塔夹芯板。所有这些表面改性技术都会增加压降。还介绍了四种情况的优良系数。