一种处理无限空间自然对流边界条件的新方法  

A Novel Method for the Treatment of Boundary Condition of Natural Convection In an Infinite Space

作　　者：丁鹏[1] 李安桂[2] 

机构地区：[1]西安交通大学能源与动力学院热流中心,陕西西安710049 [2]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《工业加热》2005年第5期14-17,共4页Industrial Heating

摘　　要：数值求解了常热流边界条件下竖直平板在无限空间里的层流自然对流问题。在103<<107,=0.71范围内得到了竖平板周围的流场和温度场分布以及平板的平均对流换热系数。提出了一种处理外部虚拟边界的新方法,将边界上的已知压力转换为速度,与已有数值解及相似解的比较表明该方法可以用较小的计算区域得到准确的结果。A numerical solution to the Navier-Stokes and energy Equations for steady laminar air natural convection from a vertical isoflux plate is presented. The stream line, isothermal and the average heat transfer coefficient were given out in the range10^3〈Ra〈10^7,Pr=0.71 A new method, named specified pressure boundary condition, for the treatment of boundary condition of the open boundary condition was prosposed, accurate result can be obtained with a relatively small computational domain. The numerical results were compared with the similarity solution and other numerical, experimental works, good agreement was found between them.

关 键 词：自然对流 无限空间 边界条件 

分 类 号：TK124[动力工程及工程热物理—工程热物理]