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Simulation of laminar impinging jet on a porous medium with a thermal non-equilibrium model

机译：热非平衡模型模拟多孔介质上的层流射流

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摘要

This work shows numerical simulations of an impinging jet on a flat plate covered with a layer of a porous material. Macroscopic equations for mass and momentum are obtained based on the volume-average concept. Two macroscopic models are employed for analyzing energy transport, namely the one-energy equation model, based on the Local Thermal Equilibrium assumption (LTE), and the two-energy equation closure, where distinct transport equations for the fluid and the porous matrix follow the Local Non-Thermal Equilibrium hypothesis (LNTE). The numerical technique employed for discretizing the governing equations was the finite volume method with a boundary-fitted non-orthogonal coordinate system. The SIMPLE algorithm was used to handle the pressure-velocity coupling. Parameters such as porosity, porous layer thickness, material permeability and thermal conductivity ratio were varied in order to analyze their effects on flow and heat transport. Results indicate that for low porosities, low permeabilities, thin porous layers and for high thermal conductivity ratios, a different distribution of local Nusselt number at the wall is calculated depending on the energy model applied. The use of the LNTE model indicates that it is advantageous to use a layer of highly conducting and highly porous material attached to the hot wall.
机译：这项工作显示了在覆盖有多孔材料层的平板上撞击射流的数值模拟。基于体积平均概念，获得了质量和动量的宏观方程。两种宏观模型用于分析能量传输，即基于局部热平衡假设（LTE）的单能量方程模型和双能量方程封闭，其中流体和多孔基质的不同传输方程遵循局部非热平衡假设（LNTE）。离散控制方程所采用的数值技术是具有边界拟合的非正交坐标系的有限体积法。 SIMPLE算法用于处理压力-速度耦合。改变诸如孔隙度，多孔层厚度，材料渗透率和导热率之类的参数，以便分析它们对流动和热传递的影响。结果表明，对于低孔隙率，低渗透率，薄多孔层以及高导热率，根据所应用的能量模型，计算了壁上局部Nusselt数的不同分布。 LNTE模型的使用表明，使用附着在热壁上的高导电性和高多孔性材料层是有利的。

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