NB Naduvinamani and GB Marali
Keywords: Numerical solution, full reynolds equation, steady-state, porous, slider bearing, couple stress
Abstract: In this paper a general dynamic Reynolds equation of sliding-squeezing surfaces with couple stress fluids is derived for the assessment of static and dynamic characteristics of porous bearings. The analysis takes into account of transient squeezing action effects and velocity slip at the porous/fluid film interface by using the modified B-J slip boundary conditions. The numerical solution of two-dimensional plane inclined porous slider bearing is illustrated. Using the perturbation technique two Reynolds-type equations governing the steady performance and the perturbed characteristics are obtained. The steady and perturbed characteristics are then numerically calculated by using finite-difference technique. From the numerical results computed it is observed that there exists a critical value for the profile parameter at which the steady-state load and dynamic stiffness coefficients attains maximum. Further it is found that this critical value of the profile parameter is a function of permeability parameter. The effects of couple stresses provide an improved performance for both steady-state, dynamic stiffness and damping characteristics. This effect is more accentuated for the porous bearings with larger values of aspect ratio.
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