金属骨架形状对瞬态固液相变传热影响的数值研究  

Numerical study of influence of metal skeleton shape on transient solid-liquid phase change heat transfer

作　　者：崔云杰 陈宝明[1] 云和明[1] 尚荣真 Cui Yunjie;Chen Baoming;Yun Heming;Shang Rongzhen(School of Thermal Energy Engineering,Shandong Jianzhu University)

机构地区：[1]山东建筑大学热能工程学院

出　　处：《区域供热》2022年第5期142-149,共8页District Heating

基　　金：国家自然科学基金面上项目(5197061221)。

摘　　要：构建了3种断面形状的二维金属骨架,与相变材料(石蜡)组成复合相变材料,利用有限元分析软件COMSOL Multiphysics对瞬态相变过程进行数值模拟,探讨了金属骨架形状对相变材料融化过程中液相分布、融化速率及温度均匀性的影响。计算结果表明:金属骨架对相变材料融化过程的促进作用表现在其加快了自然对流环状区域的形成,三角形骨架表现出最优的传热性能;孔隙率不变时,三角形骨架与石蜡组成的复合相变材料融化速率最快,内部温度均匀性最好,平均蓄热速率最块;孔隙率减小0.1后,复合相变材料的融化速率提升,提升最多的复合相变材料为三角形骨架(42.9%),其次是圆形骨架(29.1%),最后为正方形骨架(26.6%)。Three kinds of two-dimensional metal skeletons with different section shapes are constructed to form the composite phase change material(paraffin). The transient phase transition process is numerically simulated with COMSOL Multiphysics. The effects of metal skeleton shape on the liquid phase distribution, melting rate and temperature uniformity during the melting process of phase change material are investigated. The results show that the metal skeleton accelerates the formation of the circular region of natural convection, and the triangular skeleton shows the best heat transfer performance. When the porosity is constant, the composite PCM composed of triangle skeleton and paraffin wax has the fastest melting rate, the best internal temperature uniformity and the highest average heat storage rate. When the porosity decreases by 0.1,the melting rate of the composite PCM increases, with the largest increase of 42.9% for triangular skeleton, 29.1% for circular skeleton, and 26.6% for square skeleton.

关 键 词：金属骨架 复合相变材料 固液相变 自然对流 平均蓄热速率 

分 类 号：TU111.195[建筑科学—建筑理论] TK124[动力工程及工程热物理—工程热物理]