|Contour plot of the hydrodynamic pressure projected on
the film contour. The maximum pressure occurs in the
converging part of the film while cavitation pressure
manifests in de diverging part of the film.
Hydrodynamic journal bearings become unstable with small
shaft eccentricity. It's the reason that
high speed or relatively low loaded hydrodynamic bearings are to be
designed less stiff. Sometimes lemon bore or multi lobe
bearings might be an option. These bearings behave stable
even with small shaft eccentricity.
The frictional heating is calculated assuming adiabatic
boundary conditions for the bearing, i.e. power loss N is
drained with the fluid flow Q through the bearing.