Machine Design
In hydrodynamic bearings

The oil film is maintained by supplying oil under pressure
Grease is used for lubrication
The oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant

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Machine Design
Slenderness ratio is the ratio of

Effective length of column to least radius of gyration of the column
Effective length of column to width of column
Maximum size of column to minimum size of column
Width of column to depth of column

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