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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical and experimental studies of natural convection in a heated cavity with a horizontal fin on a hot sidewall
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Numerical and experimental studies of natural convection in a heated cavity with a horizontal fin on a hot sidewall

机译：在热侧壁上带有水平翅片的加热腔中自然对流的数值和实验研究

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This study presents a hybrid method of inverse method and three-dimensional computational fluid dynamics (CFD) commercial software along with various flow models and experimental data to investigate natural convection in a heated cavity with a horizontal fin on a hot sidewall. The effect of fin position and initial temperature on the results obtained is investigated. First, the inverse method of the finite difference method along with the experimental temperature data is used to estimate the heat transfer coefficient on the heating fin. Afterwards, the CFD along with various flow models and the inverse results of the obtained heat transfer coefficient is used to determine the air temperature and velocity profiles, the fin surface temperature and the heat transfer coefficient on the fins. More accurate results and appropriate flow model and grid points can be obtained if the resulting heat transfer coefficient and fin temperature are as close as possible to the inverse results and the experimental temperature measurements, respectively. The results show that the zero-equation turbulence model is more suitable for this problem than other flow models. More grid points may not necessarily get more accurate results. The present results are new findings and are different from previous 2D results, The heat transfer coefficients on the upper and lower surfaces of the fin can be different and vary with the position of the fin. The average heat transfer coefficient at the 35 mm fin position is 1.70 times that of the 85 mm fin position. An interesting finding is that the vortices at upper two corners of the cavity and near the upper surface of the fin edge vary with fin position. This means that the influence of fin position on the flow field cannot be ignored. The proposed correlation between Nusselt number and Rayleigh number well matches the inverse and numerical results obtained. (C) 2018 Elsevier Ltd. All rights reserved.
机译：这项研究提出了一种逆方法和三维计算流体动力学（CFD）商业软件的混合方法，以及各种流动模型和实验数据，以研究在热侧壁上带有水平散热片的加热腔体中的自然对流。研究了翅片位置和初始温度对所得结果的影响。首先，将有限差分法的逆方法与实验温度数据一起用于估算散热片上的传热系数。然后，将CFD与各种流动模型以及获得的传热系数的逆结果一起用于确定空气温度和速度曲线，翅片表面温度以及翅片上的传热系数。如果所得的传热系数和散热片温度分别尽可能接近反演结果和实验温度测量值，则可以获得更准确的结果以及合适的流动模型和网格点。结果表明，零方程湍流模型比其他流动模型更适合该问题。更多的网格点不一定获得更准确的结果。目前的结果是新发现，与先前的2D结果不同。鳍片上下表面的传热系数可能不同，并随鳍片位置的变化而变化。 35毫米散热片位置的平均传热系数是85毫米散热片位置的1.70倍。一个有趣的发现是，腔的上两个角处以及鳍边缘上表面附近的涡流随鳍位置而变化。这意味着翅片位置对流场的影响不容忽视。拟议的Nusselt数与Rayleigh数之间的相关性很好地与获得的逆和数值结果相匹配。 （C）2018 Elsevier Ltd.保留所有权利。

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