Abnormal behavior of a hydrodynamic lubrication journal bearing caused by wall slip

Reynolds lubrication theory assumes that there is no wall slip on the interfaces between the solids and lubricant. During recent years, however, it is found that wall slip often happens. The present paper analyzes the wall slip occurring in a hydrodynamic lubrication journal bearing. If the two surfaces have the same adhesion property wall slip always decreases the oil film load support capacity. If there is wall slip over all of the lubricated surfaces, the hydrodynamic effect of the journal bearing vanishes, and no load support exists. If the two lubricated surfaces have different adhesion properties, the wall slip effect is more complex and may cause the journal bearing to operate in an instable manner. In order to avoid the wall slip, the limiting shear stress at the bearing surface should be higher than that at the journal surface.

[1]  Ward O. Winer,et al.  The High Shear Stress Rheology of Liquid Lubricants at Pressures of 2 to 200 MPa , 1990 .

[2]  Bo Jacobson,et al.  Non-Newtonian Fluid Model Incorporated Into Elastohydrodynamic Lubrication of Rectangular Contacts , 1983 .

[3]  Liliane Léger,et al.  Surface-Anchored Polymer Chains: Their Role in Adhesion and Friction , 1999 .

[4]  Hans-Jürgen Butt,et al.  Surface roughness and hydrodynamic boundary slip of a newtonian fluid in a completely wetting system. , 2003, Physical review letters.

[5]  Meng Yong-gang,et al.  A rheological model for lithium lubricating grease , 1998 .

[6]  K. Huebner.  The finite element method for engineers , 1975 .

[7]  Motohiro Kaneta,et al.  Observation of Wall Slip in Elastohydrodynamic Lubrication , 1990 .

[8]  Chengwei Wu,et al.  Parametric Variational Principle of Viscoplastic Lubrication Model , 1992 .

[9]  Antonio Strozzi,et al.  Formulation of Three Lubrication Problems in Terms of Complementarity , 1985 .

[10]  Shi‐Qing Wang,et al.  Molecular Transitions and Dynamics at Polymer / Wall Interfaces: Origins of Flow Instabilities and Wall Slip , 1999 .

[11]  D. Williams,et al.  Shear-dependent boundary slip in an aqueous Newtonian liquid. , 2001, Physical review letters.

[12]  S. Bair,et al.  Shear strength measurements of lubricants at high pressure , 1979 .

[13]  H. Spikes.  The half-wetted bearing. Part 1: Extended Reynolds equation , 2003 .

[14]  William R. D. Wilson,et al.  Viscoplastic Behavior of a Silicone Oil in a Metalforming Inlet Zone , 1989 .