摘要
基于局部热非平衡条件,构建表征泡沫金属内填充相变材料融化传热的格子Boltzmann模型。应用该模型数值模拟泡沫金属内相变材料融化界面位置随时间变化的过程,模拟结果与其他文献的计算结果吻合较好。在此基础上,分析泡沫金属孔密度对相变材料融化传热的影响,孔密度增大一方面增强热传导传热,另一方面也降低了自然对流换热效果,因此其增大对系统整体换热影响可能是增强、降低或影响不大,结果与Rayleigh数有关。
Based on local thermal non-equilibrium between the metal matrix and phase change materials, the Lattice Boltzmann model was proposed to characterize the melting processes of phase change materials in metal foams. The melting front locations as the function of time simulated by Lattice-Boltzmann model agree well with the results obtained in the other literature. Then, the effects of pore density on the melting processes of phase change materials were investigated. The increase in the pore density not only yield the increasing conduction heat transfer but also results in the decreasing convection heat transfer, thus and may lead to the enhancement or the reduction or limited effect on the total heat transfer ultimately depending on the Rayleigh number.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2012年第9期1604-1609,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(50776015)
国家"十一五"科技支撑项目(2008BAJ12B04)
南京工程学院科研基金(Qkja2009010)
