摘要
应用 DNS 直接数值模拟对二维槽道流动聚合物减阻进行了参数研究。计算结果表明:Reynolds 数对减阻的影响是间接的,直接的控制参数是黏度比β和 Weisenberg 数。在感兴趣的范围0.9-1.0,黏度比β对于减阻的作用是线性的,而 Weisenberg 数对流动的影响比较复杂。这里存在着onset 现象和最大减阻现象,因此 Weisenberg 数是更为主要的控制参数。
The effects of the dimensionless parameters on drag reduction are investigated by direct nu-merical simulations of two-dimension channel flow of a polymer solution. The results show that the criti-cal parameters are the Weisenberg number and β,the ratio of the solvent viscosity to the total zero-shear-rate viscosity of the solution. When 0. 9 〈 β 〈1. 0,the dependence of drag reduction rate on β is linear. The effect of Weisenberg number on drag reduction is more complicated,due to the onset phe-nomena and the maximum drag reduction. So,the more important parameter is Weisenberg number.
出处
《重庆理工大学学报(自然科学)》
CAS
2014年第10期42-45,108,共5页
Journal of Chongqing University of Technology:Natural Science
基金
国家自然科学基金资助项目(10272105
10602006)