Effects of non-Newtonian rheology on the film-height history between non-parallel sliding-squeezing surfaces

Abstract

The effects of flow rheology of non-Newtonian fluids on the time-dependent film-thickness history between non-parallel sliding-squeezing surfaces are studied. On the basis of the power-law fluid model, the hydrodynamic film pressure is obtained from the non-Newtonian dynamic Reynolds-type equation by considering the transient squeezing-action effect. The hydrodynamic film force is then applied to derive the non-linear motion equation of the squeezing part. Using the non-linear transient method, the film-height trajectory of the squeezing part is presented. The results of the present study provide a reference for engineer applications in machine tools, the matched gears, the rolling elements, and the piston-cylinder systems when viscosity-pressure dependence, viscosity-temperature variation, and elastic deformations of the contacting surfaces are neglected.