Analytical solution for two-phase flow between two rotating cylinders filled with power law liquid and a micro layer of gas

被引：1
作者：
Mohammad Reza Hajmohammadi
S. Salman Nourazar
A. Campo
机构：
[1] Amirkabir University of Technology,Department of Mechanical Engineering
[2] The University of Texas at San Antonio,Department of Mechanical Engineering
来源：
Journal of Mechanical Science and Technology | 2014年 / 28卷
关键词：
Rotating cylinders; Power law; Stability; Micro gas; Energy gradient method;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
This paper deals with the effects that a thin gas layer exerts on the hydrodynamic aspects of power law liquid in a radial Couette flow between two cylinders. Analytical solution is made to determine the velocity profile in the two-phase flow system occupied by the power law liquid and the micro layer of a gas. It is shown that the thin (micro) gas layer contributes in reducing torque to set the fluid in motion in most cases. However, by considering generalized power law liquids, this paper limits the credibility for the positive role of the gas layer on reducing the torque for lubrication. For instance, when n < 0.5 (n is the behavior index of the liquid), slight increment in the torque (about 6%) is reported. Finally, energy gradient method is used for stability analysis. It is shown that the stability nature may be changed based on behavior index of the liquid.
引用
收藏
页码：1849 / 1854
页数：5
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