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Performance characteristics of oil‐in‐water mixtures in a journal bearing using different bearing materials

Oil‐in‐water (o/w) mixtures have an interesting property that has attracted the attention of tribologists, namely, that they can form thicker hydrodynamic films than those inferred from their rheological properties. The oil phase is believed to separate out on the metal surface in concentrated contacts lubricated with o/w mixtures. In this paper the performance characteristics of water‐based oils have been systematically explored for their film‐generating capabilities. The lubrication properties of o/w lubricants are studied and compared in a journal bearing rig assembly with different bearing materials. The rig is run under increasing loads and speeds in conditions pertinent to hydrodynamic lubrication. The rig has been able to operate with o/w mixtures at a concentration as low as 10 vol.%. However, the results have shown that the bearings exhibited signs of high eccentricities with o/w mixtures compared to Engineering Sciences Data Unit (ESDU) predictions. This behaviour has been attributed to shear rate effects on water‐based lubricants.