TourTourAerostatic thrust bearing with simple orifice restrictor
 Diameter bearing 2R0   10-3 m
 Diameter annulus 2R1   10-3 m
 Film thickness h0   10-6 m
 Supply pressure pS   106 Pa
 Ambient pressure pA   106 Pa
 Pressure factor β  
 Coefficient of discharge Cd  
 Pressure ratio pR/pS  
 Load capacity F*  
 Annulus/Throat ratio A3/A1  
 Pressure drop Ac  
 Flow rate M   10-6 kg/s
 Diameter orifice d   10-3 m
 Load capacity F   N
 Axial stiffness S=-dF/dh   10 6 N/m
 Flow rate Q   l/min

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 book).