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首页> 外文期刊>Numerical Heat Transfer, Part B. Fundamentals: An International Journal of Computation and Methodology >A COMPRESSIBLE APPROACH TO SOLVE COMBINED NATURAL CONVECTION-RADIATION HEAT TRANSFER IN PARTICIPATING MEDIA
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A COMPRESSIBLE APPROACH TO SOLVE COMBINED NATURAL CONVECTION-RADIATION HEAT TRANSFER IN PARTICIPATING MEDIA

机译：解决参与介质中自然对流-辐射混合传热的可压缩方法

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摘要

The need for accurate prediction of combined natural convection-radiation heat transfer in participating media has resulted in developing a few different numerical methods with different capabilities. One important aspect in treating high-thermobuoyant flow fields is to impose the compressibility effects in predictions. The Literature shows that most previous research has used incompressible algorithms to solve the combined natural convection-radiation problem. However, the research in pure natural-convection heat transfer problems has shown that the Boussinesq assumption will not result in solutions with sufficient accuracies in domains with high temperature variations. In this work, we develop a hybrid incompressible-compressible method to solve the combined natural convection-radiation heat transfer in a participating medium without addressing the Boussinesq approximation. Our results show that there are significant differences between the compressible and incompressible results in treating such high-thermobuoyant flow fields. We also show that the compressibility effects become more dominant in combined natural convection-radiation problems than in the pure natural-convection problem. So, we conclude that use of the Boussinesq assumption cannot be definitely recommended in treating thermobuoyant flow fields with strong to moderate temperature gradients. Indeed, the current developed algorithm can be used to avoid the inaccuracies resulting from the incompressible treatment of such flow fields.
机译：需要精确预测参与介质中自然对流-辐射联合传热的结果，已导致开发出几种具有不同功能的不同数值方法。处理高热力浮力流场的一个重要方面是在预测中施加可压缩性。文献表明，大多数先前的研究已经使用不可压缩算法来解决自然对流辐射综合问题。但是，对纯自然对流传热问题的研究表明，Boussinesq假设不会在具有高温变化的区域中产生具有足够精度的解决方案。在这项工作中，我们开发了一种混合不可压缩-可压缩方法，以解决参与介质中的自然对流辐射综合传热问题，而无需解决Boussinesq近似问题。我们的结果表明，在处理这种高热浮力流场时，可压缩和不可压缩结果之间存在显着差异。我们还表明，组合自然对流辐射问题比纯自然对流问题的可压缩性优势更为明显。因此，我们得出结论，绝对不能推荐使用Boussinesq假设来处理具有强至中等温度梯度的热浮力流场。实际上，当前开发的算法可以用于避免由于不可压缩处理这种流场而导致的不准确性。

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