首页> 外文会议>Proceedings of the ASME power conference 2009 >USE OF FOAM-LIKE MATERIALS TO ENHANCE HEAT TRANSFER FROM SURFACES SUBJECTED TO IMPINGING JETS
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USE OF FOAM-LIKE MATERIALS TO ENHANCE HEAT TRANSFER FROM SURFACES SUBJECTED TO IMPINGING JETS

机译:使用类似泡沫的材料来增强撞击冲击后表面的传热

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摘要

In this paper, numerical simulation of a jet impinging against a flat plane covered with a layer of a porous material is presented. The plate is kept at a temperature higher than that of the incoming fluid. Macroscopic transport equations are obtained based on a volume average concept. Discretization of such governing equations is accomplished by means of the control volume method applied with a boundary-fitted non-orthogonal coordinate system. Pressure-velocity coupling is treated with the use of the SIMPLE algorithm. Parameters such as permeability, thickness of the porous layer and thermal conductivity ratio are varied in order to analyze their effects on the local distribution of Nu. Results indicate that inclusion of a porous layer decreases the peak in Nu avoiding excessive heating or cooling at the stagnation point. Also found was that the integral heat flux from the wall is enhanced for certain range of values of layer thickness, porosity, and thermal conductivity ratio.
机译:在本文中,提出了一种喷射流撞击覆盖有一层多孔材料的平面的数值模拟。板的温度要高于流入流体的温度。宏观输运方程是基于体积平均概念获得的。这些控制方程式的离散化是通过控制体积方法和边界拟合的非正交坐标系一起实现的。使用SIMPLE算法可以处理压力-速度耦合。改变诸如渗透率,多孔层的厚度和导热率之类的参数,以便分析它们对Nu的局部分布的影响。结果表明,包含多孔层降低了Nu的峰,避免了在停滞点的过度加热或冷却。还发现,在一定范围的层厚度,孔隙率和热导率值的范围内,来自壁的积分热通量增加。

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