In the present work, the performance of oil-air two-phase flow under different\nlubricant oils was investigated. The simulation method was applied to study\nthe influence of the oil viscosity on the flow pattern, velocity distribution and\nRe number in oil-air lubrication by FLUENT software with VOF model to\nacquire the working performance of oil-air lubrication for high-speed ball\nbearing. This method was used to obtain the optimum lubrication conditions\nof high-speed ball bearing. The optimum operating conditions that produce\nthe optimum flow pattern were provided. The optimum annular flow was obtained\nby PAO6 oil with the low viscosity. Reynolds number influences the\nfluid shape and distribution of oil and air in pipe. The annular flow can be\nformed when Reynolds number is an appropriate value. The velocity distribution\nof oil-air two-phase flow at outlet was also discussed by different oil viscosities.\nThe simulating results show that due to the effect of the oil viscosity\nand flow pattern the velocity decreased and expanded gradually close to the\npipe wall, and the velocity increased close to the central pipe. The simulation\nresults provide the proposal for the design and operation of oil-air two-phase\nflow lubrication experiments in the present work. This work provides a useful\nmethod in designing oil-air lubrication with the optimum flow pattern and\nthe optimum operating conditions.
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