Abstract
In grease lubricated rolling contacts, the oil bleeding from the grease bulk forms an elastohydrodynamic lubricating (EHL) film. When the amount of bled oil at the contact inlet is insufficient, starvation occurs leading to a decrease in film thickness. Although most grease lubricated bearings operate under starvation, the correlation of starvation and film thickness is not fully understood. In this contribution, a two-phase flow CFD model is proposed. This model allows a calculation of the oil/air flow field in the vicinity of starved contacts and its effect on EHL film formation. For starvation conditions, the results show a decrease of film thickness at the center line in flow direction, while the contact sides can still remain fully supplied by replenishment.
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