波纹通道形状对流动与换热影响的数值研究  

Numerical Investigation of the Effect of Different Wavy Channels on Flow and Heat Transfer

作　　者：阴继翔[1] 郭瑞[2] 吕萍[1] 杨刚[1] 郝桂芳[1] 

机构地区：[1]太原理工大学电气与动力工程学院,太原030024 [2]太原电力专科学校,太原030025

出　　处：《太原理工大学学报》2010年第4期428-432,共5页Journal of Taiyuan University of Technology

基　　金：山西省自然科学基金资助项目(2007011062)

摘　　要：应用数值方法,研究了流体在结构对称的正弦形、三角形、椭圆形、圆弧切线形及阶梯形通道内周期性充分发展的层流流动与换热特性,分析了恒壁温、常物性条件下通道表面形状,以及雷诺数Re对流动与换热性能的影响;并对不同通道的摩擦阻力系数f、表征换热特征的努谢尔特数Nu以及综合性能参数G分别进行了比较。结果表明:阶梯形通道内流体流动的f最大,正弦形通道的次之,椭圆形通道的f随Re的变化规律与其他通道的不尽相同;不同结构通道表面Nu的相对大小与Re的范围相关,Re>150后,阶梯形通道的换热能力最强,椭圆的最弱;三角形通道的综合性能最佳,椭圆形通道的最差,除阶梯形通道外,小Re时通道的综合性能优于大Re时的性能。本研究成果为换热器设计提供理论依据。A numerical investigation of the laminar flow and heat transfer characteristics of the fluids with fully developed periodicity was conducted for periodically corrugated sinusoidal,triangular,elliptical,circular arc having two lines tangential to their sides as well as ladder shape channels with symmetrical structure. The influences of the channels surface shape as well as Reynolds numbers on the flow and heat transfer performance were investigated under constant wall temperature and fluid property. A comparison among different channels was made for friction factor（f）,Nusselt number（Nu） and comprehensive performance parameter G.The results show that the ladder channel behaves the largest f,and the following is the sinusoidal channel,while for the elliptical channel the variation rule of f with Re is different from that for others.The change of the Nu differs with various geometries and different ranges of Re.The ladder channel behaves the largest Nu,while the smallest Nu is achieved on elliptical channel for Re150,and the triangular channel has the optimal performance,while the elliptical channel is the worst（Re150）.Moreover,except for ladder channel,the comprehensive performance G is larger in small Re than in large Re.

关 键 词：流动特性 换热强化 波纹通道 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]