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首页> 外文期刊>International Journal of Heat and Mass Transfer >On the heat transfer characteristics of heat sinks: Influence of fin spacing at low Reynolds number region
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On the heat transfer characteristics of heat sinks: Influence of fin spacing at low Reynolds number region

机译：关于散热器的传热特性：低雷诺数区域的鳍片间距的影响

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摘要

This study examines the thermal-hydraulic performance of heat sinks having plate, slit, and louver fin patterns. Comparison of the associated heat transfer performance and the effect of fin spacing are made. The results indicate that the enhanced fin patterns like louver or slit fin operated at a higher frontal velocity and at a larger fin spacing is more beneficial than that of plain fin geometry. The heat transfer performance of louver fin is usually better than that of slit fin but accompanies with higher pressure drops. However, it is found that the pressure drops for slit fin is comparable to the louver fin geometry when the fin spacing is reduced to 0.8 mm. This is associated with the appreciable rise of entrance/exit loss (form drag) caused by the slit fin geometry. The test results also reveal a significant drop of heat transfer performance at a low Reynolds number and at a small fin spacing, or the so-called "maximum" phenomenon of Colburn j factor. This is applicable to all the tested geometries. By a careful examination of the test results, it is concluded that this phenomenon is related to the developing/fully developed flow characteristics. In fact, the maximum point occurred roughly at x~+ = 0.1 where fully developed and developing flow is separated.
机译：这项研究检查了具有板状，缝状和百叶窗式散热片的散热器的热工液压性能。比较了相关的传热性能和散热片间距的影响。结果表明，增强的鳍片样式（如百叶窗或狭缝鳍片）以较高的正面速度和较大的鳍片间距工作，比普通鳍片几何形状更有利。百叶窗式散热片的传热性能通常优于狭缝式散热片，但伴随着更高的压降。然而，发现当翅片间距减小到0.8mm时，狭缝翅片的压降与百叶窗翅片的几何形状相当。这与由狭缝翅片的几何形状引起的进/出口损失（形式阻力）的明显增加有关。测试结果还表明，在低雷诺数和小翅片间距的情况下，传热性能显着下降，即所谓的Colburn j因子“最大”现象。这适用于所有测试的几何形状。通过仔细检查测试结果，可以得出结论，该现象与流动特性的发展/充分发展有关。实际上，最大点大约发生在x〜+ = 0.1处，在该处完全显影和显影流分离。

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