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首页> 外文期刊>International Journal of Heat and Mass Transfer >Comparative evaluations of thermofluidic characteristics of sandwich panels with X-lattice and Pyramidal-lattice cores
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Comparative evaluations of thermofluidic characteristics of sandwich panels with X-lattice and Pyramidal-lattice cores

机译：带有X格和金字塔形格芯的夹心板的热流特性的比较评估

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摘要

This study compares the thermo-fluidic characteristics of sandwich panels with the X-lattice and the Pyramidal lattice at a given porosity and surface area density. The numerical model is validated against available experimental data at first. At a given Reynolds number in the range of 3100–5700, numerical results reveal that the X-lattice sandwich panel provides a 47–60% higher average overall Nusselt number. The special topology of the X-lattice induces counter-rotating spiral primary flow and more complex secondary flows, including one which becomes a longitudinal vortex later. The flow in the Pyramidal lattice sandwich panel is composed of a parallel primary flow and a counter-rotating vortex pair entrenched in the zone behind ligaments of the Pyramidal lattice. Compared with the Pyramidal lattice sandwich panel, endwall heat transfer of the X-lattice sandwich panel is enhanced by 75–97% and the ligaments surface heat transfer is enhanced by 85–97% at a given Reynolds number. It is also found that the friction factor of the X-lattice sandwich panel is about 2 times higher for the spiral primary flow and more complex secondary flows induced by the staggered ligaments. Finally, at a given pumping power, the cooling performance of the X-lattice is much better, too. Taking the identical fabrication method and cost into account, apparently the X-lattice is superior in engineering applications.
机译：这项研究比较了在给定的孔隙率和表面积密度下，带有X晶格和金字塔形晶格的夹芯板的热流体特性。首先根据可用的实验数据对数值模型进行验证。在给定的雷诺数为3100-5700的范围内，数值结果表明X晶格夹心板的平均总Nusselt数要高47-60％。 X晶格的特殊拓扑结构会引起反向旋转的螺旋初级流动和更复杂的次级流动，其中包括后来变成纵向涡旋的次级流动。金字塔形格子夹层板中的流动由平行的初级流动和在金字塔形格子的韧带后面的区域中ent陷的反向旋转涡流对组成。与金字塔形格状夹心板相比，在给定的雷诺数下，X格形夹心板的端壁传热提高了75–97％，韧带表面传热提高了85–97％。还发现，对于交错的韧带所引起的螺旋初级流动和更复杂的次级流动，X格子夹心板的摩擦系数大约高2倍。最后，在给定的泵浦功率下，X晶格的冷却性能也要好得多。考虑到相同的制造方法和成本，显然X晶格在工程应用中具有优势。

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