矩形流道内密度极值流体Poiseuille-Rayleigh-Bénard对流传热研究  

Research on Poiseuille-Rayleigh-Bénard Convective Heat Transfer of Fluid with Density Extremum in Rectangular Channels

作　　者：朱玉枝 李友荣[1] ZHU Yuzhi;LI Yourong(School of Energy and Power Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学能源与动力工程学院,重庆400044

出　　处：《工程热物理学报》2024年第11期3480-3486,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52076017)。

摘　　要：为了了解密度极值流体Poiseuille-Rayleigh-Bénard(P-R-B)对流流动和传热性能,采用有限容积法对具有不同宽高比水平矩形流道内冷水的P-R-B对流进行了三维数值模拟。结果表明,随着密度倒置参数的增加,Rayleigh-Bénard对流强度减弱,说明密度倒置参数对二次流动具有抑制作用。充分发展区平均Nusselt数随Rayleigh数和截面宽高比的增大而增加,随密度倒置参数的增大而减小。基于计算结果,拟合得到了密度极值流体P-R-B对流充分发展区传热关联式。In order to understand the flow and heat transfer performance of Poiseuille-Rayleigh-Bénard(P-R-B)convection of the fluid with the density extremum,a set of three-dimensional numerical simulations on P-R-B flow of cold water in horizontal rectangular channels was conducted using the finite volume method at different aspect ratios.The results show that with the increasing density inversion parameter,Rayleigh-Bénard convection weakens,which hints that the secondary flow is suppressed by the density inversion phenomenon.The heat transfer performance in the fully developed zone is improved with the increasing cross-sectional aspect ratio and Rayleigh number,and the decreasing density inversion parameter.Based on the simulation data,the heat transfer correlation of P-R-B flow of cold water in the fully developed zone was established.

关 键 词：Poiseuille-Rayleigh-Benard对流 密度倒置参数 流型 传热 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]