Abstract
The experimental results in a previous paper indicated that the angular extent of the oil film for porous journal bearings with no oil-feed hole, which is used as a small element of the feed port for nonporous bearings, is significantly smaller than half of the bearing circumference. In the present paper, the oil film extent under hydrodynamic lubrication conditions is theoretically analyzed on the basis of the following postulate : when the oil film extent reaches steady state, the inflow of oil into the bearing clearance through the porous matrix due to the oil-feed pressure must make up for the oil leakage from the clearance to both ends and to the porous matrix due to the hydrodynamic pressure generated in the oil film. The results show that the oil film region extends over a wide range for the higher dimensionless oil-feed pressure and smaller Sommerfeld number, which can be explained by the balance between the inflow and outflow across the oil film region. The data on the oil film extent are confirmed to be in agreement with the experimental results.
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