Thermal instability and heat transfer of viscoelastic fluids in bounded porous media with constant heat flux boundary  

作　　者：牛骏 石在虹 谭文长 

机构地区：[1]Petroleum Exploration and Production Research Institute of SINOPEC [2]State Key Laboratory for Turbulence and Complex Systems and Department of Mechanics and Aerospace Engineering College of Engineering Peking University

出　　处：《Journal of Hydrodynamics》2015年第5期809-812,共4页水动力学研究与进展B辑（英文版）

基　　金：Project supported by the National Key Basic Research Development Program of China(973 Program,Grant Nos.2006CB705803,2013CB531200);the National Natural Science Foundation of China(Grant No.21571188)

摘　　要：A numerical simulation is performed for thermal instability and heat transfer of viscoelastic fluids in bounded porous media under the bottom constant heat flux boundary condition. The results for six different combinations of relaxation and retardation times demonstrate the existence of the thermal instability induced flow bifurcation. It is found that the increase of the relaxation time can enhance the heat transfer efficiency by disturbing the fluid flow and facilitating the bifurcation. The increase of the retardation time can stabilize the flow and postpone the bifurcation, leading to simpler flow pattern and lower heat transfer rate.A numerical simulation is performed for thermal instability and heat transfer of viscoelastic fluids in bounded porous media under the bottom constant heat flux boundary condition. The results for six different combinations of relaxation and retardation times demonstrate the existence of the thermal instability induced flow bifurcation. It is found that the increase of the relaxation time can enhance the heat transfer efficiency by disturbing the fluid flow and facilitating the bifurcation. The increase of the retardation time can stabilize the flow and postpone the bifurcation, leading to simpler flow pattern and lower heat transfer rate.

关 键 词：thermal instability heat transfer viscoelastic fluid porous media BIFURCATION 

分 类 号：O357.3[理学—流体力学]