2R1: The size of the pocket must be as
small as possible to make the bearing less sensitive to
instability. The minimal value of R1 is limited by Ac.
h0: A high axial bearing stiffness,
self-aligning capability and the minimal flow is obtained
with small film thickness. The minimal value of the film
thickness is limited by bearing deflections and flatness of the
bearing surface and is usually related to the bearing size.
Ac: The pressure drop over passage A1 of
the simple orifice restrictor is more than four times higher
than that over the annulus area A3 when Ac>1 (Fig 12.2 of the