物性参数对环形空间流动和传热影响的模拟研究  

Numerical study on influence of physical parameters upon flow and heat transfer in annular space

作　　者：郑杨艳[1,2] 陆群晖[1] 袁彪[3] 

机构地区：[1]江苏省特种设备安全监督检验研究院,江苏南京210003 [2]南京工业大学机械与动力工程学院,江苏南京210009 [3]江苏省产品质量监督检验研究院,江苏南京210007

出　　处：《热科学与技术》2012年第2期112-117,共6页Journal of Thermal Science and Technology

基　　金：江苏省科技支撑计划资助项目(BE2010748)

摘　　要：利用有限容积法,建立了环形空间内单相流体竖直向上流动过程中流动和传热的稳态模型。模型将环形空间内管设置为具有固定生热速率的发热体;流体与内管壁之间设置流动和传热边界层,以更精确的描述壁面位置流体与固体之间动量和热量的耦合传递过程。通过与常物性模型的对比,流体密度、导热系数和黏度随温度变化的变物性模型,在传热能力上具有一定的减少,流体与固体传热面之间的界面剪切力稍有下降。通过比较常物性模型和变物性模型的Re和Ri,结果表明,随着流体强制循环速度的加大,流体物性变化对流动和传热过程的影响逐渐减小。Based on the finite volume method,a steady state flow and heat transfer model of a single phase flow flowing vertically upward in annular space was established.The inner cylinder of the annular space was set as a heating body with fixed heat generation rate.Flow and heat transfer boundary layers were set between the flow and the inner cylinder wall,in order to give more accurate description of momentum and heat coupling and transfer processes between the fluid and the solid near the wall.Compared with the constant physical property model,the variable physical property model,in which the fluid density,heat transfer coefficient,and viscosity change along with the temperature,has relatively lower heat transfer capacity and a little bit lower interface shear stress between the fluid and the solid heat transfer surfaces.Through the comparison between Re and Ri of the constant physical property model and the variable physical properties model,it can be concluded that the physical property changes of the fluid have gradually lower impact on flow and heat transfer processes along with the acceleration of the forced circulation of the fluid.

关 键 词：变物性 环形空间 流动 传热 模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]