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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study of heat transfer characteristics in a 180-deg round turned channel with discrete aluminum-foam blocks
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Experimental study of heat transfer characteristics in a 180-deg round turned channel with discrete aluminum-foam blocks

机译：具有离散铝泡沫块的180度圆形转弯通道内传热特性的实验研究

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摘要

This work experimentally investigated the local and average heat transfer characteristics in a 180-deg round turned channel with discrete aluminum-foam blocks. The air was used as coolant. Several aluminum-foam blocks (0.90 porosity and 10 PP1 pore density) were installed discretely in the 180-deg round turned channel with the square cross section. Total four kinds of test section, with various arrangements of aluminum-foam blocks, were employed. The results indicate that the local peak values of the Nusselt numbers would appear at the positions of the aluminum-foam blocks. The local Nusselt numbers of the upper and bottom walls were higher than those of the side walls in the straight ducts; while the local Nusselt numbers of the outer side wall were higher than those of others walls in the turn. The local Nusselt numbers of the inner side wall generally were the lowest values. Besides, the average Nusselt numbers of the present porous channels were 74-140% higher than that of the empty channel, suggesting the significant heat transfer enhancement of the aluminum-foam blocks. Furthermore, in the straight duct, the staggered aluminum-foam blocks could promote heat transfer more efficiently than the symmetric aluminum-foam blocks did. The average Nusselt numbers of Model 3 and Model 4 (the whole channel filled with aluminum-foam blocks) were 20-30% higher than those of Model 1 and Model 2 (only straight ducts filled with aluminum-foam blocks). It is noteworthy that the pressure drops of Model 1 and Model 3 test sections (vertically symmetric configuration) are much higher than those of Model 2 and Model 4 test sections (vertically staggered configuration) by 180-280%.
机译：这项工作通过实验研究了具有离散铝泡沫块的180度圆形转弯通道中的局部和平均传热特性。空气用作冷却剂。几个铝泡沫块（孔隙率为0.90，孔隙密度为10 PP1）离散安装在具有方形横截面的180度圆形转弯通道中。总共使用了四种测试部分，并配置了各种不同的铝泡沫块。结果表明，Nusselt数的局部峰值将出现在铝泡沫块的位置。直管中上壁和底壁的局部Nusselt数高于侧壁。而外侧壁的本地Nusselt数则比其他墙壁的Nusselt数高。内侧壁的局部努塞尔数通常是最低值。此外，目前的多孔通道的平均努塞尔数比空通道的平均努塞尔数高74-140％，这表明铝泡沫块的传热显着增强。此外，在直风道中，交错的铝泡沫块比对称的铝泡沫块可以更有效地促进热传递。模型3和模型4（填充铝泡沫块的整个通道）的平均Nusselt数比模型1和模型2（仅填充铝泡沫块的直管）的平均Nusselt数高20-30％。值得注意的是，模型1和模型3测试部分（垂直对称配置）的压降比模型2和模型4测试部分（垂直交错配置）的压降高180-280％。

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