Performance analysis of annular disks with non-Newtonian Rabinowitsch fluid model: Influence of squeeze film pressure, surface roughness, porosity and viscosity variation.

In various systems of energy, such as turbo-machinery and viscous-lock system, squeeze film plays a crucial role for improving transport systems. The importance of the aforementioned applications led us to explore the physical behavior of Rabinowitsch fluid flow for several values of viscosity, Q ∈ [ 0 − 1 ] , load capacity (W ∗) , nonlinear factor, ω = [ − 2 × 1 0 − 4 , 0 , 2 × 1 0 − 4 ] , dimensionless film thickness (h ∗) , dimensionless radius of the capillary tube (R 0 ∗) , dimensionless thickness of porous pad (H 0 ∗ = 0 , 0. 1 , 0. 2), inner and outer radius ratio (Ω = 0 , 0. 2 , 0. 4) , roughness parameter (c ∗ = 0 , 0. 1 , 0. 2 , 0. 3 , 0. 4) through a squeeze film with two rough porous annular discs. Five-point Gauss quadrature integral formula has been used to examine the characteristics of annular discs, and small perturbation method has been used to discretize the governing Rabinowitsch fluid flow (RFF) equations. The modified Reynolds equation for rough, porous and viscosity change with film thickness is developed using Christensen's stochastic theory, modified Darcy's theory and the association between viscosity and film thickness agreement. The impacts of ω on the behavior of porosity and viscosity variability of RFF have been visually depicted in terms of film pressure, load capacity and squeeze reaction time of annular discs. It has been determined that for RFF with variable viscosity and roughness parameter on a porous media, the performance of the annular disks enhances for ω = − 2 × 1 0 − 4 (dilatant lubricant), and diminishes for ω = 2 × 1 0 − 4 (pseudo-plastic lubricant). It has been found that the film pressure in case of dilatant lubricant is increased by the influence of Rabinowitsch fluids on porous walls, but the behavior of pseudo-plastic lubricants has an opposite tendency relative to Newtonian lubricants. It has also been found that the impact of variability in porosity, roughness and viscosity diminishes the load-carrying capacity (LCC) with increased film thickness than the case of nonporous, smooth surface and constant viscosity of Rabinowitsch fluid. [ABSTRACT FROM AUTHOR]