含内热源多孔介质-自由流通道内非达西强制对流  

Non-Darcian Forced Convection In The Porous-Fluid Channel With Internal Heat Source

作　　者：李琪[1] 郭蕊 王柳淇 胡鹏飞[1] LI Qi;GUO Rui;WANG Liuqi;HU Pengfei(School of Energy and Power Engineering,Northeast electric power university,Jilin132012,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林132012

出　　处：《工程热物理学报》2023年第6期1631-1641,共11页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.52276174);吉林省科技发展计划项目(No.20220101357JC,No.20210101086JC)。

摘　　要：基于多孔介质局部非热平衡模型,对考虑内热源条件下的多孔介质-自由流耦合通道内非达西对流换热特性进行研究。多孔介质区内流体运动方程采用Darcy-Brinkman-Forchheimer模型,利用有限差分法获得通道内各区域流体运动速度、流固相温度分布及努塞尔数,并进一步分析了相关参数对流体流动传热的影响。结果表明:在文中研究参数下,惯性参数F_(f)对通道内各区域流体速度及温度分布的影响仅在达西数Da大于10^(-3)时需要考虑;增加F_(f)或降低固相内热源W_(s)绝对值会使流固两相温差减小,且改变固相内热源换热方向会使多孔介质区内流固相发生温度分岔现象;固相内热源对通道换热效果影响较大且更为复杂,不同惯性参数F_(f)下,考虑W_(s)时可能会使Nu出现奇异点。Based on the local thermal non-equilibrium model in porous media,the Non-Darcian forced convection characteristics in a porous-fluid coupled channel with internal heat source are studied.The Darcy-Brinkman-Forchheimer model is used in porous media to describe fluid motion in porous media.By using the finite difference method,the fuid velocity,fuid and solid temperatures and Nussel number in the partially flled porous channel are obtained.The influences of related parameters on convective heat transfer are further analyzed.The results show that with the present parameters in this paper,the infuence of the inertia parameter F_(f) on the fuid velocity and temperature distributions in each region of the channel should be considered only when the Darcy number is greater than 10^(-3).Increasing F_(f) or decreasing the absolute value of internal heat source within the solid phase W_(s) reduces the temperature difference between the fluid and solid phases in the porous media,and the temperature bifurcation phenomenon occurs in the porous media as changing the direction of internal heat exchange in solid phase.Internal heat source within the solid phase has a large and complex effect on heat transfer of the channel.Under different inertia parameters F_(f),Nu may appear singularity point when considering W_(s).

关 键 词：多孔介质 自由流 内热源 非达西强制对流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]