摇摆条件下窄矩形通道内流动传热特性数值模拟  

Numerical Simulation on Fluid Flow and Heat Transfer Characteristics of Narrow Rectangular Channel in Rolling Motion

作　　者：李隆键[1] 董相禄[1] 马建[2] 黄彦平[2] 

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044 [2]中国核动力研究设计院中核核反应堆热工水力技术重点实验室,成都610041

出　　处：《核动力工程》2013年第4期84-89,共6页Nuclear Power Engineering

摘　　要：建立窄矩形通道在摇摆条件下湍流流动的物理数学模型,应用数值分析方法模拟窄矩形通道的三维非稳态流动的传热过程;考察摇摆条件下通道内流动阻力和换热性能及其随雷诺数Re、摇摆周期T及摇摆幅度max影响的变化规律。结果表明,摇摆状态下窄矩形通道内速度场呈周期性变化;时均摩擦系数favg和时均努塞尔数Nuavg比非摇摆工况下的结果大,Nuavg满足拟合公式0.851 0.4Nu 0.023Re Pr;在相同Re和摇摆周期T下,通道内流体摩擦压降和Nu的变化幅值随max的增大而增大,其变化周期等于T;在相同Re和max下,摩擦压降pf和Nu的变化幅值随T的增大而减小,其变化周期等于T。The three dimensional unsteady physical model and mathematical model of turbulent flow and heat transfer in the narrow rectangular channel were established, and the corresponding flow field and temperature field was numerically simulated. The time-averaged Nusselt number and time-averaged friction coefficients of the channel were investigated under different Reynolds number. The computed results showed that the time-average Nusselt number and time-averaged friction coefficient is larger slightly than the one in the steady-state, and both the Nusselt number and frictional pressure drop of the channel were oscillated periodically along with rolling period and rolling amplitude.

关 键 词：窄矩形通道 摇摆条件 流动与传热 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]