We cannot answer directly because the influence of the inertia depends on both the geometrical bearing characteristics and the operating conditions. The inertia effects modify locally (at the level of the film thickness discontinuities) and globally on the pressure profile. Those effects are negative and so, the hydrodynamic pressure field will be reduced and the bearing force will be consequently decreased too.

Thanks for your prompt answer, Dr. Michel! Do you know any study/paper investigating how the effects of fluid inertia could modify the system stability? Or how the approach (NS or Re) could provide a better prediction of the system behaviour?

Dear Wederley,

You can see lot of information in the books of Andras Szeri.

On ResearchGate, you can also find information like:

https://www.researchgate.net/publication/235651773_Inertia_and_Thermal_Effects_in_Turbulent_Flow_Journal_Bearing

As well as in the notes of Prof. Luis San Andrès:

http://www.google.fr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=11&ved=0CFoQFjAK&url=http%3A%2F%2Frotorlab.tamu.edu%2Fme626%2FNotes_pdf%2FNotes07%2520Thermal%2520Anaysis%2520JBs%2520w%2520examples.pdf&ei=0YBcVP_9O9LkarOagJgF&usg=AFQjCNF9LQT4ZkH0keyDupCfPunsYSM0kQ&sig2=KL0P1VXzQqk1kzdIloenGg&bvm=bv.79184187,d.d2s

On stability, there is a paper in BalkanTrib'05 :

http://www.academia.edu/6164405/Effect_of_Fluid_Inertia_on_the_Stability_of_Journal_Bearings

Best regards,

Michel

Article Inertia and Thermal Effects in Turbulent Flow Journal Bearing