含趋旋微生物纳米流体在拉伸缸表面上的边界层流动分析  

Boundary layer flow on a stretching cylinder in a nanofluid containing gyrotactic microorganisms

作　　者：许晓勤[1] 黄惠[2] XU Xiaoqin;HUANG Hui(College of Automobile,Fujian Chuanzheng Communications College,Fuzhou,Fujian 350007,China;School of Mechanical Engineering and Automation,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福建船政交通职业学院汽车学院,福建福州350007 [2]福州大学机械工程及自动化学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2022年第5期667-674,共8页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家重点研发计划资助项目子课题(2019YFB2005103);福建省自然科学基金资助项目(2021J01337);福建船政交通职业学院博士科研启动基金资助项目(20200301)。

摘　　要：考虑趋旋微生物的影响,研究纳米流体在拉伸缸表面上的稳态二维边界层流动问题.建立控制方程,采用打靶法和Runge-Kutta法进行数值求解,对不同物理参数下的速度场、温度场、浓度场和运动微生物密度场的变化趋势进行图形化分析.结果表明,在靠近缸体表面处,速度、温度、体积分数和微生物密度均随着曲率参数的增大而减小,而在远离缸体表面时变化情况却相反;微生物密度随着Brown运动参数、Peclet数、Schmidt数和生物对流常数的增大而减小,而随着热泳参数的增大而增大.Considering the effect of gyrotactic microorganisms,the steady two-dimensional boundary layer flow of nanofluid on a stretching cylinder is explored in this paper.The governing equations are established and solved by the shooting and Runge-Kutta methods.The effects of different physical parameters on the dimensionless velocity,temperature,nanoparticle concentration and density of motile microorganisms are investigated and presented graphically.The results show that the velocity,temperature,nanoparticle concentration and density of motile microorganisms decay via larger curvature parameter near the cylinder,while the opposite trend is observed as one moves away from the surfac e of cylinder.It is also noticed that the density of microorganisms is a decreasing function of Brown motion parameter,Peclet number,Schmidt number and bioconvection constant,but is incremented when thermophoresis parameter is increased.

关 键 词：纳米流体 趋旋微生物 边界层流动 拉伸缸 

分 类 号：O315.2[理学—一般力学与力学基础]