Calculator for air bearings fed throug a porous surface

Aerostatic
thrust bearing fed through a porous ring shaped area

Diameter 2R0 (outer diameter
bearing)

10^{-3} m

Diameter
2R1 (outer diameter porous ring)

10^{-3} m

Diameter
2R2 (inner diameter porous ring)

10^{-3} m

Film thickness h0

10^{-6} m

Supply pressure pS

10^{6}
Pa

Ambient pressure pA

10^{6}
Pa

Restrictor pressure β=(p_{r}-p_{a})/(p_{s}-p_{a})

Permeability k_{p}

10^{-15} m^{2}

Restrictor
pressure pR

10^{6}
Pa

Flow rate M

10^{-6}
kg/s

Thickness porous surface

10^{-3} m

Load capacity F

N

Axial bearing stiffness S=-dF/dh

10^{6}
N/m

Flow rate Q

l/min

Permeability: This material
constant determines the thickness of the porous surface
required to get the right pressure drop from pS to pR. The
permeability can be reduced by impregnating the porous
material.