Forced convection in high porosity metal foams
Forced convection in high porosity metal foams
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DOI：
10.1115/1.1287793
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发表时间：
2000-08-01
影响因子：
--
通讯作者：
Mahajan, RL
中科院分区：
文献类型：
--
作者：
Calmidi, VV;Mahajan, RL
本文报道了高孔隙率（孔隙率近似为0.89 -0.97）泡沫金属中强迫对流的实验和数值研究。以空气为流体介质，对不同孔隙率和孔密度的泡沫铝金属进行了实验。努塞尔数数据已获得作为孔隙雷诺数的函数。在数值研究中，半经验的体积平均形式的控制方程。速度分布是通过调整动量方程的精确解获得的。能量传输模型没有调用局部热平衡的假设。模型的热扩散传导率，k（d），和间隙传热系数，h（SF），假设的基础上的物理参数。在这些模型中的经验常数确定Yb匹配的数值结果与实验数据在这项研究中，以及在公开文献中获得的。在整个研究参数范围内实现了良好的一致性，表明所提出的处理方法足以模拟大多数实际应用中的金属泡沫中的强制对流。
This paper reports an experimental and numerical study of forced convection in high porosity (epsilon similar to0.89-0.97) metal foams. Experiments have been conducted with aluminum metal foams in a variety of porosities and pore densities using air as the fluid medium. Nusselt number data has been obtained as a function of the pore Reynolds number. In the numerical study, a semi-empirical volume-averaged form of the governing equations is used. The velocity profile is obtained by adapting an exact solution to the momentum equation. The energy transport is modeled without invoking the assumption of local thermal equilibrium. Models for the thermal dispersion conductivity, k(d), and the interstitial heat transfer coefficient, h(sf), are postulated based on physical arguments. The empirical constants in these models are determined yb matching the numerical results with the experimental data obtained in this study as well as those in the open literature. Excellent agreement is achieved in the entire range of the parameters studied, indicating that the proposed treatment is sufficient to model forced convection in metal foams for most practical applications.