摘要
基于局部热非平衡条件在表征单元尺度上构建出双温度分布函数的格子Boltzmann方程,用该方程来表征泡沫金属骨架与相变材料融化传热的温度场,用密度分布函数演化方程来表征融化液相速度场.然后模拟了泡沫金属内相变材料融化界面位置随时间的变化及金属骨架和相变材料的温度分布情况.模拟结果与其他文献的计算结果吻合较好.重点分析了泡沫金属孔隙率对相变材料融化传热的影响.结果表明,孔隙率的减少有利于增强金属骨架热传导换热的作用,但也会导致自然对流传热的降低及相变材料蓄热量的减少.因此在设计泡沫金属蓄热装置时,对于孔隙率的确定需要结合工程需求进行选择.
Under local thermal non-equilibrium conditions, a lattice Boltzmann model based on double temperature equations was constructed to characterize the temperature field of metal foams framework and heat conduction of phase change materials in metal foams, and a equation based on density distribution function was constructed to characterize the velocity field of melt fluid. The melt- ing front locations as a function of time and the temperature field were simulated by the lattice Boltz- mann model. The results agree well with the results obtained in other literature. Then, the effects of porosity on the melting processes of phase change materials were investigated. The results show that the decrease of the porosity results in the increasing conduction heat transfer, the decreasing convec- tion heat transfer and the decreasing heat storage capacity. Therefore, it is suggested to consider en- gineering requirements to determine porosity in the design of the foam metal heat storage device.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第1期94-98,共5页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(50776015
51206076)
"十二五"国家科技支撑计划资助项目(2012BBA07B02)
科技部国际科技合作技术交流专项资助项目(2011DFA60290)
