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首页> 外文期刊>International Journal of Heat and Mass Transfer >Steady mixed convection in a differentially heated square enclosure with an active rotating circular cylinder
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Steady mixed convection in a differentially heated square enclosure with an active rotating circular cylinder

机译：在带有主动旋转圆柱的差热方形加热箱中的稳定混合对流

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摘要

Mixed convection in a square enclosure with a rotating cylinder centered within it is numerically studied. Depending on the rotation of the cylinder, the natural and forced convection effects can be combined or opposite. However, due to the complex flow structure assumed by the flow, in some conditions the combined effects do not lead to the maximum overall heat transfer crossing the enclosure. The rotating cylinder participates on both the conductive and convective heat transfer processes, and exchanges heat with the fluid naturally, without imposition of a thermal condition at its surface. It is explored the influence of the cylinder through its radius, rotating velocity, thermal conductivity and thermal capacity on the resulting mixed convection problem. Thermal field is visualized using the isotherms, the flow structure is visualized through the streamlines, and the heat transfer process is visualized through the heat-lines. For the first time, these visualization tools are applied to a moving solid. The overall thermal performance of the enclosure is analyzed through the overall Nusselt number. For a better understanding of the participation of the cylinder on the heat transfer process, the local heat exchanged between the cylinder surface and the fluid is also analyzed. Results clearly show how the rotating cylinder affects the thermal performance of the enclosure, and how the thermophysical properties of the cylinder are important on the overall heat transfer process across the enclosure.
机译：对方形外壳中的混合对流进行了数值研究，方形外壳内有一个旋转圆柱体。取决于气缸的旋转，自然对流和强制对流效应可以组合或相反。但是，由于流动所采用的复杂流动结构，在某些情况下，综合作用不会导致穿过外壳的最大总传热。旋转圆柱体参与传导和对流的热传递过程，并与流体自然地进行热交换，而不会在其表面施加热条件。通过圆柱体的半径，转速，导热系数和热容量来研究圆柱体对混合对流问题的影响。使用等温线显示热场，通过流线显示流动结构，通过热线显示传热过程。这些可视化工具首次应用于移动的实体。外壳的整体热性能通过整体Nusselt数进行分析。为了更好地了解气缸在热传递过程中的参与，还分析了气缸表面与流体之间交换的局部热量。结果清楚地显示出旋转的圆柱体如何影响外壳的热性能，以及圆柱体的热物理性质在整个外壳的整个传热过程中如何重要。

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