摘要
对矩形腔内冷热壁面位于侧壁不同相对位置时的自然对流换热问题进行了数值模拟。腔体左侧局部壁面维持恒定高温，右侧局部壁面维持恒定低温，左右侧壁的其它部分以及顶部和底部壁面绝热。按照冷热壁面的相对位置是否左右对称，通过改变 Rayleigh 数的大小，分析了不同工况下矩形腔内温度场、流场和热壁表面平均 Nusselt 数的变化，得到了 Rayleigh 数在10^3-10^6之间的结果。冷热壁面对称分布时，位于侧壁中部的换热作用最强；不对称分布时，热壁面位于侧壁中部、冷壁面位于侧壁上部的换热作用最强。
A numerical simulation was performed to study the natural convection and heat transfer of fluid contained in a rectangular cavity influenced by the different positions of thermal walls.The partial part of the left side wall was set at a high constant temperature and the partial part of the right side wall was set at a low constant temperature.The other parts of the side walls and the top and bottom of the cavity were thermally insulated.Under the conditions of symmetrical or a symmetrical location of thermal walls,the flow and temperature fields and the average Nusselt number of thermal walls were analyzed under different Rayleigh numbers.The results were obtained with Rayleigh numbers between 103 and 106 .The heat transfer rate is high at the middle part of thermal walls in symmetrical case and at the middle-top part in asymmetrical case.
出处
《上海理工大学学报》
CAS
北大核心
2014年第6期527-531,共5页
Journal of University of Shanghai For Science and Technology
基金
国家自然科学基金资助项目(51006071)
关键词
矩形腔
边界条件
自然对流
数值模拟
rectangular cavity
boundary conditions
natural convection
numerical simulation
