金属泡沫平板结构内对流换热的数值研究

基于Brinkman-Darcy模型和两方程模型,本文对流体在金属泡沫平板通道内的强制对流换热进行了自编程数值模拟,采用体积平均法对流体在金属泡沫内的流动和换热进行宏观处理。模拟结果表明：流体主流速度随孔密度增大而减小,随孔隙率增大而增大；流体相和固体相之间的局部对流换热系数随孔隙率和孔密度增加而增加,金属泡沫对流换热性能随孔隙率增大而减小,随孔密度增大而增大。金属泡沫强化换热的效果十分明显,可以应用于需要强化换热的紧凑式换热器和散热器。

Numerical study of forced convective heat transfer in the metal-foam parallel-plate channel

Based on the Brinkman-Darcy model and two-equation model, the forced convective heat transfer in metal-foam parallel-plate is numerically simulated with self-developed code. Macroscopic flow and heat transfer of fluid in metal foams is treated with the volume-averaging method. With the decrease in pore density or the increase in porosity, the main velocity of fluid is increased. The local convective heat transfer coefficient of solid and fluid phases is increased by increasing porosity or pore density. The overall thermal resistance for convection in metal foams is decreased with the increase in porosity but is increased with the increase in pore density. Metal foams own obvious heat transfer enhancement effect, which can be used for the compact heat exchangers and heat sinks requiring heat transfer enhancement.