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首页> 外文期刊>Energy Conversion & Management >Analytical solution for evaluating the thermal performance and efficiency of convective-radiative straight fins with various profiles and considering all non-linearities
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Analytical solution for evaluating the thermal performance and efficiency of convective-radiative straight fins with various profiles and considering all non-linearities

机译：评估具有各种轮廓的对流辐射直翅片的热性能和效率并考虑所有非线性的解析解决方案

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摘要

If the temperature change from the base to the tip of the fin is large, then for an accurate prediction of the performance of the fin, the model must incorporate the variation of thermal conductivity with temperature. Also, the heat exchange with the surrounding air is associated with the heat transfer coefficient. It has been experimentally proven that the heat transfer coefficient may not be uniform and there are large differences in the heat transfer coefficient both from fin base to fin tip and along the fin in the direction of the airflow. Same as two parameters mentioned above, the surface emissivity and internal heat generation within the fins may vary with temperature. This paper analytically investigates the temperature distribution within convective-radiative straight fins with simultaneous variation of thermal conductivity, heat transfer coefficient, surface emissivity and internal heat generation with temperature. Also, convection and radiation sink temperatures were assumed to be non-zero. Four different longitudinal fins such as rectangular, triangular, convex and exponential were considered. The calculations are carried out using the well-known approximate analytical differential transformation technique. Fin efficiency and the effects of some physically applicable parameters in this problem such as thermal conductivity, convection-conduction parameter, radiation-conduction parameter, convection sink temperature and radiation sink temperature were studied comparatively. Because a broad range of governing parameters are investigated, the results should be useful in a number of engineering applications.
机译：如果从散热片底部到散热片尖端的温度变化很大，则为了准确预测散热片的性能，该模型必须考虑导热系数随温度的变化。而且，与周围空气的热交换与热传递系数相关联。实验已经证明，传热系数可能不均匀，并且从翅片基部到翅片尖端以及沿着翅片在气流方向上的传热系数都存在较大差异。与上述两个参数相同，散热片内的表面发射率和内部发热可能随温度变化。本文分析研究了对流辐射直翅片内的温度分布，同时热导率，传热系数，表面发射率和内部热量随温度而变化。此外，对流和辐射阱温度也假定为非零。考虑了四个不同的纵向鳍，例如矩形，三角形，凸形和指数形。使用众所周知的近似分析微分变换技术进行计算。比较研究了翅片效率和一些物理适用参数在此问题中的影响，如导热系数，对流传导参数，辐射传导参数，对流沉温度和辐射沉温度。因为研究了广泛的控制参数，所以结果在许多工程应用中应该是有用的。

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