摘要
对底部中心位置具有不同大小内热源的二维封闭方腔自然对流换热问题进行了数值模拟。通过改变内热源量纲1高度b和Rayleigh数的大小,分析了不同工况对封闭方腔内温度场、流场结构和热源表面平均Nusselt数的影响。数值模拟结果表明:b和Ra的大小对封闭方腔内空气的流动换热有着重要影响;热源表面Nuave是Ra和b的增函数,且其增幅随Ra的增加而增加,随b的增加而减小。
A numerical simulation of natural convection was conducted in the middle of a rectangular cavity with a heater of variable dimension.Analyses on isotherms,streamlines and average Nusselt number in the rectangular cavity were carried out by varying the values of dimensionless height b and Rayleigh number.The simulation results show that b and Ra have a great effect on the natural convection in the rectangular cavity.Nuave grows with the increase of b and Ra,and the growth rate is proportional to Ra and inversely proportional to b.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2010年第6期1373-1378,共6页
CIESC Journal
基金
长江学者和创新团队发展计划项目(IRT0746)~~
关键词
自然对流
封闭方腔
内热源
数值模拟
natural convection
rectangular cavity
heater of variable dimension
numerical simulation
