The loose-ring lubricator is used as a pump within self-contained journal bearings to deliver lubricating fluid from a reservoir or sump to the bearing. It is desired to understand its behaviour sufficiently to be able to predict the performance of new designs. An analytical model is derived that uses the balance of forces acting on the ring to predict the ring speed. The delivered flowrate is then estimated using viscous lifting theory. The results compare favourably with experimental data and published empirical models. Improvements are also suggested to account for additional influences that might affect actual lubricator operation.
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