圆内开缝圆不同开缝方向自然对流换热.pdf

第35卷第5期
上海理工大学学报
J. University of Shanghai for Science and Technology
Vol.35No.52013
文章编号:1007~6735(2013)05-0425-05
凤内开缝圆不同开缝方向自然对流换热
中春赟1,杨茉,王津1,张見1,张玉文2
(1.上海理工大学能源与动力工程学院,上海20003;2.密苏里大学机械与航空航天工程学院,哥伦比亚65211)
摘要:米用 SIMPLE方法对圆内开缝圆在不同开缝方向时的自然对流换热进行了数值模拟,根据
数値结果,分析了开缝圆不同开缝方向的自然对流换热规律和特性.数值结果表明:采用 SIMPLE
方法的计算结果与已有文献相同エ沉的实验结果相吻合;同一开缝方向,平均当量导热系数Kes
随着瑞利数Ra的增加而增大,当a较小时,Kegs基本不随开缝方向的改变而变化;当Ra继续
増大,同一Ra下开缝方向从竖直到水平随角度9增大Keqs值变小;当Ra超过一个临界值时,
Kas数值结果出现了振荡,且这个临界值与开缝方向相关;研究水平开缝的圆内开缝圆自然对流
换热,随着a的增加,能够获得稳定解、周期性振荡解及非周期振荡解,最终为混沌
关键词:自然对流;数值模拟;开缝圆;非线性特性
中阳分类号:TK124
文献标志码:A
Natural Convection Heat ransfer Characteristics of a Circle with
an Internal Concentric Round Slotted in Different Direction
SHEN Chun yun, YANG Mo, WANG Jin, ZHANG Kun, ZHANG Yu-wemp
(1. School of Energy and Power Engineering, University of Shanghai for Science amd Technology, Shanghai200093, China
2. Departmet of Mecanical a Aeos ce Eie i, eiy of Misouri, olumbia, 651)
Abstract: Using the SIMPLE method the natural convection transfer problem of a circle with an
internal slotted circle was numerically simulated under different slotting directions. The natural
convection heat transfer characteristics of the slotted circle were analysed under different slotting
differents according to the numerical results, which coincide well with the experimental results of
an existing literature under the same working conditions. In the same slotting direction, the average
equivalent thermal conductivi s incas with the increase of Ra. When Ra is small, Kes does
not change basically with the change of slotting direction. When R continues to increase, under a same
Ra with e lot an m i l zonal, K bemes smller. When R
eced a critcal value, the numerical result of Kes en o luce, an h c ical value s related o
te slo nn T l on n er f a nl o n w hin the circle
was studied. It is conce that h te in of R it i ible o obtain e ion, periodically
oscillating s ions, no e lion son an ultimaely reach a chaos state
收稿日期:2013-01-04
基金项目:国家自然科学基金资助项目(51076105);上海市科委振兴东北科技合作资助项目(11195820500),上海市质量技
术监督局公益科研资助项目(2012-12
第一作者:申春赟(1990-),女,博士研究生.研究方向:传热及数值技术.E-mail:chunyunshen@126.com
通讯作者:杨苿(1958-),男,教授.研究方向:传热及数值技术.E-mail:yang@usst.edu.cn