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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >An experimental and numerical investigation of mixed convection from a heat generating element in a ventilated cavity
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An experimental and numerical investigation of mixed convection from a heat generating element in a ventilated cavity

机译：通风腔内生热元件混合对流的实验和数值研究

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摘要

This study reports the results of an experimental and numerical investigation of mixed convection from a heat generating element in a ventilated cavity. Experiments were carried out for heaters of two different sizes, located centrally in a parallelepiped that has an air inlet and an outlet port. An induced fan at the outlet is used to create a flow, thereby facilitating studies in the complete mixed convection regime. After a detailed parametric study, correlations have been developed for the average Nusselt number and the maximum dimensionless temperature occurring in the heat generating element. Experiments have been backed up by a numerical analysis of fluid flow and heat transfer for a geometry that corresponds exactly to the one used for the experiments. The good agreement between the experiments and the numerical results confirms the adequacy of the two dimensional approximation and the turbulence closure model employed. Based on the numerical results, the position of the heat source was changed in order to improve the heat transfer performance and the experiments were repeated for this new position. Hence, a combined experimental and numerical investigation will significantly reduce the effort required to optimize the thermal performance in problems of this class. (c) 2007 Elsevier Inc. All rights reserved.
机译：这项研究报告了来自通风腔中生热元件的混合对流的实验和数值研究的结果。对两种不同尺寸的加热器进行了实验，这些加热器位于平行六面体的中央，平行六面体具有进气口和出气口。出口处的感应风扇用于产生气流，从而有助于在完整的混合对流方案中进行研究。经过详细的参数研究后，已针对发热元件中出现的平均Nusselt数和最大无量纲温度建立了相关性。通过对与实验所用几何形状完全对应的几何形状的流体流动和热传递进行数值分析来支持实验。实验与数值结果之间的良好一致性证实了二维近似和所采用的湍流闭合模型的适当性。根据数值结果，改变了热源的位置以改善传热性能，并对该新位置重复了实验。因此，结合实验和数值研究将大大减少优化此类性能中的热性能所需的精力。 （c）2007 Elsevier Inc.保留所有权利。

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