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首页> 外文期刊>International Journal of Heat and Mass Transfer >Enhancement of natural convection fins by high-frequency forced oscillations
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Enhancement of natural convection fins by high-frequency forced oscillations

机译：高频强制振荡增强自然对流散热片

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摘要

This paper conveys a numerical simulation of an active enhancement device for natural convection in the interfin spaces of a fin array. A baseline solution for the non-enhanced situation revealed that the confinement created by the walls of adjacent fins and the base surface gave rise to a drastic reduction of the heat transfer coefficient values compared with those for the standard vertical plate. This outcome demonstrated the necessity for enhancement. The enhancement device investigated here communicated with the interfin space via an opening in the base surface. Enhancement was achieved by alternately introducing and extracting air into and from the space. The frequency of the introduction/extraction cycle was varied over values of 0, 10, 50, and 100 Hz. For each of these cases, spatially local, cycle-averaged heat transfer coefficients were determined on the bounding surfaces of the interfin space and on the outboard surface of a fin that faced a large ambient space. Results were also obtained for the cycle- and spatially averaged coefficients. Even at a low oscillation frequency of 10 Hz, the interfin heat transfer coefficients were significantly enhanced but not sufficiently to overcome the confinement effect. At 100 Hz, the enhancement gave rise to coefficient values that are about 64 times greater than the unenhanced values.
机译：本文提供了一个在翅片阵列的翅片空间中自然对流的主动增强装置的数值模拟。对于非增强型情况的基线解决方案显示，与标准垂直板相比，相邻散热片壁和底面所形成的限制大大降低了传热系数值。这一结果证明了增强的必要性。此处研究的增强装置通过底面中的开口与鳍间空间连通。通过交替向该空间引入空气和从该空间抽出空气来实现增强。引入/提取循环的频率在0、10、50和100 Hz的值上变化。对于这些情况中的每一种，在中间鳍片空间的边界表面和面对大周围空间的鳍片外侧表面上，确定空间局部的，周期平均的传热系数。还获得了周期和空间平均系数的结果。即使在10Hz的低振荡频率下，翅片间的传热系数也显着提高，但是不足以克服限制作用。在100 Hz时，增强产生的系数值约为未增强值的64倍。

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