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首页> 外文期刊>International Journal of Heat and Mass Transfer >Orientation effects on thermal performance of radial heat sinks with a concentric ring subject to natural convection
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Orientation effects on thermal performance of radial heat sinks with a concentric ring subject to natural convection

机译：具有自然对流的同心环对径向散热器的热性能的取向影响

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摘要

In this study, the orientation effect on the thermal performance of radial heat sinks with a circular base, concentric ring, and rectangular fins were investigated experimentally and numerically. The effects of orientation angle with respect to gravity (0≤θ≤180°), Elenbaas number (0.5＜El＜50), and non-dimensional fins spacing (0.273 ≤s~*≤ 0.617) on Nusselt number are considered. Experimental results show that horizontally oriented radial heat sinks (θ = 0° or 180°) have better thermal performance than vertically oriented radial heat sink (θ = 90°). The present numerical model is shown to predict the experimental results well within error of 4%, and suggests that the inferiority of vertically oriented heat sink can be attributed to the existence of the concentric ring, which can shield the natural convective upward flow. The radial heat sink in orientation 0° is found to have slightly better thermal performance than that in 180° when s~* is relatively large, and vice versa. Based on the experimental and numerical results, a closed-form correlation with associated orientation effect factor is proposed for predicting Nusselt number, as a function of aforementioned nondimensional parameters.
机译：在本研究中，通过实验和数值研究了取向对带有圆形底座，同心环和矩形散热片的径向散热器的热性能的影响。考虑了取向角相对于重力（0≤θ≤180°），埃伦巴斯数（0.5 ＜El ＜50）和无尺寸鳍片间距（0.273≤s〜*≤0.617）对努塞尔数的影响。实验结果表明，水平方向的径向散热器（θ= 0°或180°）比垂直方向的径向散热器（θ= 90°）具有更好的热性能。结果表明，该数值模型可以很好地预测实验结果，误差在4％以内，表明垂直定向散热器的劣势可以归因于同心环的存在，它可以屏蔽自然对流向上流动。当s〜*相对较大时，定向为0°的径向散热器的热性能要比180°的略好，反之亦然。根据实验和数值结果，根据上述无量纲参数，提出了一种封闭形式的相关联的取向影响因子，用于预测努塞尔数。

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