Drag reduction by linear viscosity model in turbulent channel flow of polymer solution  

作　　者：吴桂芬 李昌烽 黄东升 赵作广 冯晓东 王瑞 

机构地区：[1]School of Energy and Power Engineering,Jiangsu University [2]Shanghai Maple Automobile Co.Ltd

出　　处：《Journal of Central South University》2008年第S1期243-246,共4页中南大学学报（英文版）

基　　金：Project(10672069) supported by the National Natural Science Foundation of China

摘　　要：A further numerical study of the theory that the drag reduction in the turbulence is related to the viscosity profile growing linearly with the distance from the wall was performed.The constant viscosity in the Navier-Stokes equations was replaced using this viscosity model.Some drag reduction characteristics were shown comparing with Virk's phenomenology.The mean velocity and Reynolds stress profiles are consistent with the experimental and direct numerical simulation results.A drag reduction level of 45% was obtained.It is reasonable for this linear viscosity model to explain the mechanism of turbulence drag reduction in some aspects.A further numerical study of the theory that the drag reduction in the turbulence is related to the viscosity profile growing linearly with the distance from the wall was performed. The constant viscosity in the Navier-Stokes equations was replaced using this viscosity model. Some drag reduction characteristics were shown comparing with Virk’s phenomenology. The mean velocity and Reynolds stress profiles are consistent with the experimental and direct numerical simulation results. A drag reduction level of 45% was obtained. It is reasonable for this linear viscosity model to explain the mechanism of turbulence drag reduction in some aspects.

关 键 词：TURBULENCE drag reduction VISCOSITY profile POLYMERS VELOCITY REYNOLDS stress 

分 类 号：O631.3[理学—高分子化学]