多孔壁面槽道湍流中的流动阻力和传热  

Turbulent flow and heat transfer in a channel with porous media

作　　者：张一凡 刘财喜[1] 董宇红[1] ZHANG Yifan;LIU Caixi;DONG Yuhong(Shanghai Institute of Applied Mathematics and Mechanics,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学上海市应用数学和力学研究所,上海200072

出　　处：《上海大学学报（自然科学版）》2018年第3期378-391,共14页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(11272198;11572183)

摘　　要：为了研究多孔介质壁面对槽道湍流流动及传热的影响,基于容积平均和局部热平衡法对含有多孔介质壁面槽道湍流的流场和热场进行直接数值模拟(direct numerical simulation,DNS),讨论了具有不同达西数和孔隙率的多孔介质固壁对剪切湍流的阻力系数及传热Nusselt数的影响.研究结果表明,较高的孔隙率会产生较明显的减阻效应,而较高的达西数会提高传热效率.Turbulent flow and heat transfer in a channel with two parallel porous walls are reported.The Darcy-Brinkman-Forcheimer(DBF)acting model based on volume averaged hypothesis is added to the Navier-Stokes equation to simulate the flow bounded by porous media.The effects of porosity and Darcy numbers on skin-friction drag as well as Nusselt numbers are studied.The results on statistical quantities for flow field and temperature field show that the skin-friction drag decreases as the porosity becomes larger,and the Nusselt numbers may increase leading to enhancement of heat transfer efficiency when the Darcy number increases.

关 键 词：多孔介质 壁湍流 流动减阻 传热 

分 类 号：O359[理学—流体力学]