周期加热对倾斜槽道对流特性的影响  

Effect of periodic heating on convection characteristics of inclined channel

作　　者：徐泊冰 宁利中[1] 宁碧波[2] 田伟利[3] XU Bobing;NING Lizhong;NING Bibo;TIAN Weili(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi’an University of Technology,Xi’an 710048,China;College of Construction Engineering,Jiaxing University,Jiaxing 314001,China;Academy of Fine Arts,Shanghai University,Shanghai 200444,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048 [2]嘉兴学院建筑工程学院,浙江嘉兴314001 [3]上海大学美术学院,上海200444

出　　处：《西安理工大学学报》2020年第1期59-64,共6页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(10872164);西北旱区生态水利国家重点实验室基金资助项目(2017ZZKT-2)。

摘　　要：利用二维流体力学基本方程进行数值模拟,讨论了Pr=6.99的流体的对流斑图及其相关特性。在长高比Γ=40的倾斜放置的矩形槽道中,设定倾斜角度20°,左侧具有通过流动且底部周期加热。结果表明:周期加热与通过流动作用下,相对Rayleigh数一定时,Reynolds数增大对流强度减弱,Nusselt数减小,对流稳定所用时间先增长后缩短,槽道内最大垂直流速增大。Reynolds数一定时,相对Rayleigh数增大对流强度增强,Nusselt数增大,对流稳定所用时间增长,槽道内最大垂直流速增大,二分之一槽道高度处垂直流速增大。The convection pattern of Pr=6.99 fluid and its related characteristics are studied by numerical simulation of two-dimensional basic equations of fluid mechanics.The inclined angle is set at 20 degrees in a rectangular channel with an aspect ratio ofΓ=40,the left side has a through flow and the bottom is heated periodically.The results show that under the action of periodic heating and through flow,the convection and the Nusselt number decrease with the increase of Reynolds number,that the time required for convection stabilization increases first and then decreases,and that the maximum vertical velocity increases with the increase of Reynolds number when reduced Rayleigh number is constant.When Reynolds number is fixed,the convection and the Nusselt number increase with the increase of reduced Rayleigh number,the time spent for convection stabilization increases,the maximum vertical velocity in the channel increases,and the vertical velocity increases at the half height of the channel.

关 键 词：周期加热 通过流动 相对Rayleigh数 REYNOLDS数 对流斑图 

分 类 号：O357[理学—流体力学]