Few experimental investigations on the relation between the nonlinearity of lubricants and the performance of bearings have been published. Theoretical analysis of the relation was presented in the first paper, and experimental analysis of this problem is conducted in this paper. The initial viscosity and the coefficient of pseudo-plasticity are given by the investigation of the flow rate of pseudo-plastic fluids obtained by adding polyisobutylene to spindle oils. The coefficient of pseudo-plasticity is a scale to indicate the behavior of this lubricant. Analyzing the experimental results of the performance of bearings using this lubricant, it is found that the film pressure and the load capacity of pseudo-plastic fluids are smaller than those of Newtonian fluids whose viscosity is equal to the initial viscosity. These values become smaller with an increase in nonlinear factor and eccentricity ratio of bearing.
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Wada et al. (1971) studied this question.