POROUS SLEEVE BEARINGS - AIR AND OIL PERMEABILITY

Experimental results on permeability are given for the flow of air and oil through porous sleeve bearings. For air, the flow characteristics are simpler than for oil and the flow rate is higher However, due to air compressibility and inertial effects, the pressure - flow relation is non-linear and the calculated static permeability depends on an im posed pressure drop. In contrast, the flow of oil through a porous sle eve bearing under a constant pressure drop is generally of a non-stati onary nature, and the calculated permeability is a function of time. M utual relations between permeability values calculated from the air an d oil flow characteristics are presented.