MATHEMATICAL ANALYSIS OF NEWLY DESIGNED TWO POROUS LAYERS SLIDER BEARING WITH A CONVEX PAD UPPER SURFACE CONSIDERING SLIP an‎d SQUEEZE VELOCITY USING FERROFLUID LUBRICANT

This paper proposes mathematical modelling and analysis of ferofluid lubricated newly designed slider bearing having convex pad (surface or plate) stator with two porous layers attached to the slider. The problem considers the effect of slip velocity proposed by Sparrow et. al.[17] and modified by Shah et al. [9] at the film-porous interface. The squeeze velocity V=-h, which appears when the upper impermeable plate approach to the lower one, is also considered here for study. The magnetic field is assumed to be oblique to the lower plate. From the Reynolds's equation of the above model, expressions for dimensionless form of pressure and load carrying capacity are obtained. The expression for the dimensionless load carrying capacity is then solved numerically to examine its possible effect on the designed bearing system. From the results it is concluded that (1) When ki>k2, dimensionless load carrying capacity increases about 6.35 % for both h = 0, and h0 as compared to (2) The dimensionless load carrying capacity increases about 113 % for both h= 0 and h≠ 0 when k1= k2 = 0.0001 as compared to ki = k2 = 0.01. In the above results ki and ky represents the permeabilities of the upper and lower porous layers (matrixes) respectively