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首页> 外文期刊>Applied Mathematical Modelling >Numerical analysis of convection heat transfer from an array of perforated fins using the Reynolds averaged Navier-Stokes equations and large-eddy simulation method
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Numerical analysis of convection heat transfer from an array of perforated fins using the Reynolds averaged Navier-Stokes equations and large-eddy simulation method

机译：使用雷诺平均Navier-Stokes方程和大涡模拟方法对多孔翅片对流传热的数值分析

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摘要

Extended surfaces (fins) are frequently used in heat exchange devices to increase the heat transfer between a primary surface and the surrounding fluid. In the present study, we determined the thermal performance of an efficient type of perforated fin and we compared the results with those obtained for a simple solid fin and a flat surface without fins in the same working conditions. The modeled geometry comprised fins that had small channels with a circular cross section and different configurations, which were arranged stream-wise along the fin's length. The turbulent flow field around the perforated fins was modeled using the Reynolds averaged Navier-Stokes (RANS) equations and large-eddy simulation (LES) method with a suitable subgrid-scale model. The conjugate differential equations for both the solid and gas phases were solved simultaneously using the finite volume procedure with the SIMPLE algorithm. For LES, the flow and heat transfer characteristics were determined for a Reynolds number equal to 3.2x10(4) based on the fin length and a Prandtl number of 0.71. The results indicated that among the different configurations, the fins with three openings had the best thermo-hydraulic performance. In addition, we found that although the heat transfer rates predicted by RANS and LES were in close agreement, there were noticeable differences in the important flow characteristics, such as the recirculation zone around the fins and the total drag force on them. (C) 2018 Elsevier Inc. All rights reserved.
机译：延伸表面（散热片）经常用于热交换设备中，以增加主表面与周围流体之间的热传递。在本研究中，我们确定了一种高效类型的带孔翅片的热性能，并将结果与​​在相同工作条件下获得的简单固体翅片和不带翅片的平坦表面所获得的结果进行了比较。建模的几何形状包括散热片，这些散热片具有带有圆形横截面的小通道和不同的配置，沿着散热片的长度方向沿流方向排列。使用雷诺平均Navier-Stokes（RANS）方程和大涡模拟（LES）方法以及合适的亚网格规模模型对穿孔翅片周围的湍流场进行建模。使用有限体积程序和SIMPLE算法同时求解固相和气相的共轭微分方程。对于LES，根据翅片长度和0.71的普朗特数确定雷诺数等于3.2x10（4）的流量和传热特性。结果表明，在不同的构型中，具有三个开口的散热片具有最佳的热工性能。此外，我们发现，尽管RANS和LES预测的传热速率非常接近，但重要的流动特性（如鳍片周围的回流区和对鳍片的总阻力）却存在明显差异。 （C）2018 Elsevier Inc.保留所有权利。

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