Analytical models are derived for the viscosity and the density of aerated oil in fluid-film bearings. The models account for the effects of fluid-film pressure, fluid-film geometry, oil aeration rate and bubble surface tension. The viscosity model confirms experimental evidence that the viscosity of aerated oil can be significantly higher than for non-aerated oil. The new models can be used with Reynolds' equation to predict the behavior of fluid-film bearings lubricated by aerated oil.
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Jorgen L. Nikolajsen (1999) studied this question.
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