最大偏心圆环空间自然对流传热的数值分析  

Numerical study of natural convection heat transfer in a maximum eccentric horizontal annulus

作　　者：王健敏[1] 何杰[2] 

机构地区：[1]广东省仲恺农业技术学院,广东广州510225 [2]华南理工大学电力学院,广东广州510640

出　　处：《计算力学学报》2003年第5期616-620,共5页Chinese Journal of Computational Mechanics

摘　　要：采用正切圆坐标变换 ,对不同直径比以及上、下、侧面三种偏心位置 ,偏心率达到最大值± 1的变壁温水平圆柱环形封闭空间内空气的自然对流传热进行了数学模拟 ,求出的二维空间温度分布与实验拍摄相应的温度干涉条纹图片吻合良好。计算结果同时给出流线分布及内、外壁面的局部传热系数、热流量。并与现有的偏心率小于 1的有关资料作对比分析。数值计算的范围是 :2 .0× 1 0 2 ≤ Ra≤ 3 .0× 1 0 5,1 .3≤ Do/Di≤ 3 .8,Pr=0 .70 6,|ε|=1 .A numerical analysis about steady state laminar natural convection heat transfer in a maximum eccentric horizontal annulus with different diameter ratios and three eccentric positions of the top, the bottom and the side is given in this paper. The tangent circle coordinate system and its transformation were applied to the numerical simulations for the special physical boundary. Both the two dimension temperature distributions obtained from the numerical analysis and the interferogram of experiments were presented for comparison, and they are coincident correspondingly. The local film heat transfer coefficients and heat flux on both inner and outer walls obtained by the numerical simulations are also presented. The rangs of numerical calculation are 2.0×1 0 2≤Ra≤3.0×10 5, 1.3≤D 0/D i≤3.8,Pr= 0.706 ,|ε|=1.

关 键 词：最大偏心圆环 空间自然对流传热 数值分析 工程传热学 正切圆坐标变换 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TB115[动力工程及工程热物理—热能工程]