梯形截面通道三面加热时层流换热性能数值模拟  

Numerical Simulation of Laminar Forced Convection Through a Passage With Trapezoid Cross Section and Three Walls Heated

作　　者：吴双应[1] 刘宇红[1] 李友荣[1] 李隆键[1] 

机构地区：[1]重庆大学动力工程学院,重庆400044

出　　处：《石油化工高等学校学报》2010年第2期76-79,83,共5页Journal of Petrochemical Universities

基　　金：重庆市自然科学基金项目(CSTC;2006BB6226)

摘　　要：在恒热流工况下,对梯形截面通道不同结构参数下三维层流换热的热力性能进行数值模拟。研究了底面夹角θ为60°、75°、85°,结构参数b/a(上底宽为a,高为b)的范围为1/4~4/3,梯形截面通道三面加热(下底壁面绝热)时不同截面上的温度场和速度场,以及轴向不同截面上平均努谢尔特数的变化规律,并把结果与四面加热时的情况进行了比较。研究结果表明,梯形截面通道三面加热时的温度分布、传热性能和结构参数的影响规律与四面加热时有明显的不同。A numerical method for simulating three-dimensional laminar forced convective heat transfer in a horizontal passage with trapezoid cross section under uniform heat flux condition was presented.The results presented cover structure parameter b/a range of 1/4~4/3,and included angle of bottom side θ range of 60°,75° and 85°.The developments and distributions of heat transfer and flow fields,and the average Nusselt numbers at different axial cross-sections in the horizontal passage with trapezoid cross section were discussed when three walls of passage were heated and bottom wall was insulated.In addition,the results were compared with those of four walls heated.The results show that the temperature distribution,convection heat transfer performance and the effects of structure parameters for a passage with trapezoid cross section and three walls heated are different from those with four walls heated.

关 键 词：层流换热 梯形截面通道 热力性能 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]