圆内开缝圆环自然对流换热数值解的唯一性  

BIFURCATION OF NUMERICAL SOLUTION OF NATURAL CONVECTION IN HORIZONTAL CYLINDRICAL ENVELOPE WITH AN INTERNAL CONCENTRIC HEATED CYLINDER WITH SLOTS

作　　者：杨沫[1] 陶文铨[1] 杨金顺[1] 金虹[1] 杨善让[1] 徐志明[1] 

机构地区：[1]东北电力学院,西安交通大学动力学院

出　　处：《工程热物理学报》1995年第1期91-95,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金

摘　　要：本文用数值方法研究了开缝圆环自然对流换热数值解的唯一性。计算发现，对一定的缝隙度，Ｒａ数在某一临界值时数值解出现分歧。Ｒａ大于该临界值时，数值计算可能得到双环流流型，也可能得到叁环流流型，取决于计算的初值。缝隙度增加，临界Ｒａ数降低。The bifurcation of natural convection in horizontal cylindrical envelope with an internal concentric heated cylinder with slots is numerically investigated. It is found that for a given slot width there is a critical Rayleigh number above which bifurcation occurs. When Rayleigh number is greater than its critical value, the flow pattern may be of double-vortex type or triple-vortex type, depending on its initial distribution. If the range of Ra=2*104 ～ 10￣6,the relationship between slot width and the critical Raleigh number has been revealed. Thelarger the slot width, the lower the critical Raleigh number.

关 键 词：唯一性 数值解 自然对流 圆内开缝圆环 

分 类 号：TK124[动力工程及工程热物理—工程热物理]