• 论文 •

### 铁磁流体润滑中的非牛顿流影响

1. 北京航空航天大学 机械工程及自动化学院
• 收稿日期:1999-09-06 出版日期:2001-01-31 发布日期:2010-11-19
• 作者简介:池长青(1934-),男,江苏南京人,教授,100083,北京.
• 基金资助:

高等学校博士学科点专项科研基金资助项目(96110008C)

### Non-Newtonian Effects on Ferrofluid Lubrication

CHI Chang-qing

1. Beijing University of Aeronautics and Astronautics, School of Mechanical Engineering and Automation
• Received:1999-09-06 Online:2001-01-31 Published:2010-11-19

Abstract: The load carrying capacity of the ferrofluid lubricating films can be controlled directly by means of the applied magnetic field, since the viscosity of the ferrofluid increases in the case of magnetic field. The experimental investigations showed that the ferrofluid is an non-Newtonian fluid: it behaves simultaneously as a Binghamoplastic and as a pseudoplastic. The non-Newtonian behavior of the ferrofluid is dependent both on oreintation and on intensity of the applied magnetic field. The constitutive equation of the ferrofluid can be expressed as τ(H,D)=τs(H)+η1(H)D+η2(H)D2. It is possible that the "solid" cores appear and adhere to the surfaces of bearing, since the ferrofluid has a yield shear stress τs(H). The pseudoplastic behaviors of the ferrofluid have an effect on the condition for core occurrence. The cross section C0 of a pure Couette flow in the ferrofluid lubricated bearing is different from that in the ordinary Binghamoplastic lubricated bearing. The solutions of load carrying capacity and friction force of plane slider lubricated with ferrofluid are given as an actual example.