In fluid film bearings it is difficult to ensure that lubricant which has once traversed the length of the film is not immediately reintroduced at the entry end of the film. The ability of cooler feed oil to be drawn into the film is controlled by the viscosity of the hot carryover oil adhering to the runner or journal surface. A modified Reynolds equation is derived which incorporates a variation of viscosity through the thickness of the film. Application of this modified equation to the case of a square taper-film pad shows that variation of viscosity through the film thickness at film entry can have a very significant effect upon the operating conditions of a bearing.
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