狭缝高度对传热倍增及温度漂移特性的影响  

Effect of gap height on multiple enhancement of heat transfer and characteristics of temperature drift

作　　者：包芸[1] 林泽鹏 

机构地区：[1]中山大学力学系,广州510275

出　　处：《计算机辅助工程》2017年第5期57-62,共6页Computer Aided Engineering

基　　金：国家自然科学基金(11372362;11452002);国家自然科学基金委员会-广东省人民政府联合基金(第二期)超级计算科学应用研究专项(nsfc2015_570)

摘　　要：为研究隔板对流装置的传热特性和温度漂移特性与系统几何尺寸的关系,采用DNS方法对不同狭缝高度和不同隔板数目的隔板对流装置进行计算,结果表明:传热通道中单向层流化的流动具有很好的二维性,二维与三维模拟计算得到相同的Nu。对多层隔板对流装置的传热倍增特性进行二维数值模拟发现:改变隔板顶端狭缝高度,传热倍增效果进一步增强;在隔板厚度相同时,不同隔板数的隔板对流装置存在一致的最优狭缝高度。定量研究传热通道的温度漂移量与狭缝高度的关系,发现二者存在标度律变化关系。In order to study the relationship between the characteristics of heat transfer and temperature drift of the partitioned convection device and the system geometrical dimensions, DNS method is used to calculate the partitioned convection device under different gap height and number of partitions. The results show that the unidirectional laminar flow in the heat transfer channel shows 2D character obviously, and the 2D sample shares an equal Nu with 3D sample. A 2D numerical simulation is performed to study the multiplication enhancement of heat transfer of partitioned convection device. The result shows that： the heat transfer efficiency can be enhanced further by changing the height of gaps; while the partition’s thickness is equal, there is a coincident optimal gap height while the numbers of the partitions are different. The relationship between the temperature drift and heat transfer channel gap height is studied quantitatively, and it is found that there is a scaling relationship between them.

关 键 词：隔板对流装置 传热倍增 狭缝高度 温度漂移 传热通道 NU 

分 类 号：O35[理学—流体力学] O551.3[理学—力学]