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首页> 外文期刊>Numerical Heat Transfer, Part A. Application: An International Journal of Computation and Methodology >Numerical simulation of turbulent convective heat transfer in square ribbed ducts
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Numerical simulation of turbulent convective heat transfer in square ribbed ducts

机译：方肋管内湍流对流换热的数值模拟

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This article reports on an investigation on numerical prediction of thermal characteristics of a certain type of duct. The ducts consider ed have rib turbulators to enhance the heat transfer rate. The calculation method consists of a low Re number turbulence model and two methods for determining the turbulent Reynolds stresses, namely, a simple eddy viscosity model (EVM) [I] and an explicit algebraic stress model (EASM) [2]. The model development is carried out to make the original EASM consistent with the low Re number k-epsilon turbulence model applied. A certain Method is developed to deal with the decoupling of the velocity and Reynolds stress fields in the collocated grid arrangement that is chosen in this study. The SIMPLEC algorithm handles the pressure-velocity coupling. The computations are performed with the assumption of fully developed pe, iodic conditions. These models ale used to predict the convective turbulent forced convection in different test cases and the results are compared with experiments. A ribbed duct with two ribs on opposite walls is chosen and the obtained results including the mean thermal characteristics of the considered duct are compared with an experimental correlation. Two further duct configurations, identical to an experimental setup, are then computed. These experimental cases are chosen because detailed thermal-hydraulic information is available and then local comparisons between the two prediction models and experimental results ave possible. The calculated mean and local thermal-hydraulic values are compared with corresponding experimental data and the prediction capabilities of the two turbulence models (EVM) and EASM) are discussed The results show that the EASM has some superiority over the EVM in the prediction of the velocity field structure, but the mean thermal predictions are not very different. There are also some important features of the flow field, which are not revealed by the EVM calculations. However, the required CPU times are considerably higher for the EASM case. [References: 21]
机译：本文报告了对某种类型管道的热特性进行数值预测的研究。被认为是的管道具有肋状湍流器，以提高热传递速率。计算方法包括低Re数湍流模型和两种确定湍流雷诺应力的方法，即简单涡流粘度模型（EVM）[I]和显式代数应力模型（EASM）[2]。进行模型开发以使原始EASM与应用的低Re数k-ε湍流模型一致。开发了某种方法来处理本研究中选择的并置网格布置中速度场和雷诺应力场的解耦。 SIMPLEC算法处理压力-速度耦合。该计算是在充分发展的PE碘条件的假设下进行的。这些模型用于预测不同测试案例中的对流湍流强迫对流，并将结果与​​实验进行比较。选择在相对的壁上具有两个肋的带肋管道，并将获得的结果（包括所考虑管道的平均热特性）与实验相关性进行比较。然后计算出另外两个与实验设置相同的管道配置。选择这些实验案例是因为可以获得详细的热工水力信息，然后可以在两个预测模型和实验结果之间进行局部比较。将计算出的平均和局部热工水力值与相应的实验数据进行比较，并讨论了两种湍流模型（EVM）和EASM的预测能力。结果表明，在速度预测中，EASM优于EVM。场结构，但平均热预测并没有很大的不同。流场还有一些重要特征，EVM计算并未揭示这些特征。但是，对于EASM，所需的CPU时间要高得多。 [参考：21]

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