梯度骨架-翅片结构强化传热的模拟研究  

Numerical research on enhancement of heat transfer of gradient skeleton-fin structure

作　　者：尚荣真 陈宝明[1] 云和明[1] 常钊 SHANG Rongzhen;CHEN Baoming;YUN Heming;CHANG Zhao(School of Thermal Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]山东建筑大学热能工程学院,山东济南250101

出　　处：《山东建筑大学学报》2023年第5期82-89,126,共9页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金项目(51976111)。

摘　　要：添加金属骨架是提高相变材料热性能的有效途径之一。为了探究含金属骨架相变方腔内部因对流而导致融化不均的问题,采用有限元方法,数值模拟了4种骨架(均匀骨架、梯度骨架、均匀骨架-翅片、梯度骨架-翅片)的融化过程。结果表明:4种不同结构的金属骨架中,梯度骨架-翅片结构具有最优的传热特性,翅片的存在提高了方腔内部相变材料的融化速率,缩短了融化时间;添加翅片还可以改善复合相变方腔内部温度的均匀性;以添加均匀骨架腔体为基准,含梯度骨架-翅片结构复合相变方腔的蓄热率提高了24.83%;翅片结构参数也影响相变方腔的传热特性,当翅片层数为2层、间距为4 mm、厚度为0.4 mm时,梯度骨架-翅片结构具有较好的传热特性。The addition of metal skeleton is one of the effective ways to improve the thermal properties of Phase Change Materials.The aim of this project has therefore been to research the uneven melting caused by convection in the phase change cavity of the metal skeleton.The finite element method is used to study the melting behavior of four kinds of skeletons(uniform skeleton,gradient skeleton,uniform skeleton-fin,gradient skeleton-fin).The results of this study show that the gradient skeleton-fin structure in the four different metal skeletons has optimal heat transfer characteristics.The fins increase the melting rate of Phase Change Materials inside the square cavity and shorten the melting time.The fins also improve the internal temperature uniformity of the composite phase change cavity.Taking the addition of uniform skeleton cavity as the benchmark,the heat storage rate of the phase change cavity of the gradient skeleton-fin structure is increased by 24.83%.Fin structure parameters also affect the heat transfer characteristics of the phase change cavity.When the number of fin layers is 2,the spacing is 4 mm,and the thickness is 0.4 mm,the gradient skeleton-fin structure has better heat transfer characteristics than the others.

关 键 词：多孔介质 梯度骨架-翅片 强化传热 

分 类 号：TK02[动力工程及工程热物理]