不同属性肋片对复杂方腔自然对流影响的数值分析  

Finite element analysis of natural convection of air in a 2D complex square cavity with four kinds of ripplet

作　　者：王小华[1] 魏英杰[2] 朱文芳[3] 

机构地区：[1]浙江大学,杭州310027 [2]哈尔滨工业大学,哈尔滨150090 [3]浙江科技学院,杭州310012

出　　处：《应用力学学报》2010年第2期345-350,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50708030)

摘　　要：采用二阶全展开Euler-Taylor-Galerkin分裂步有限元方法,在指定的网格密度条件下,在流动对应的普朗特数取为0.71,雷诺数取为104的情况下,数值分析了热肋、冷肋、上绝热肋、下绝热肋等四种不同属性肋片对封闭方腔内典型自然对流流动的影响。计算结果表明,肋片的存在对封闭方腔内的自然对流及相应的传热效率具有较强的影响,对流流动结构以及平均Nusselt数随肋片的属性发生较大的改变。a second order finite element analysis with 100×100 uniform square elements is performed to investigate the influence of four kinds of ripplet on natural convection flows in a 2D squre cavity.The problem is solved by using a second order Euler-Taylor-Galerkin finite element method of fractional steps.The geometrical configurations considered are namely hot,cold,upward adiabatic and downward adiabatic ripplet.The results obtained show that the character of the ripplet affects the flow structure and heat transfer rate in the cavity while keeping Pr=0.71 and Ra=104.The averaged Nusselt number on the walls varied with the width(height) of each ripplet.The study shows that the averaged Nusselt number for square cavity with ripplet is lower than those for just a cavity.

关 键 词：肋片 复杂方腔 自然对流 数值分析 

分 类 号：TB126[理学—工程力学]