Abstract
The present theoretical work investigates the combined impacts of non-Newtonian (pseudoplastic and dilatant) lubricants and surface roughness on the performance of squeeze films lubrication between two rough circular plates. The modified Reynolds equation has been derived on the basis of Christensen’s stochastic theory of hydrodynamic lubrication for rough surfaces. The lubricant model adopted for the analysis is Rabinowitsch fluid model – an experimentally verified fluid model for lubricated bearing systems. Two types of one-dimensional roughness patterns (radial and azimuthal) have been considered in the analysis. An asymptotic solution for squeeze film pressure, load carrying capacity and squeeze film time are obtained. The numerical results for dimensionless film pressure, load carrying capacity and film squeezing time have been calculated for various values of fluid and operating parameters. The results for dimensionless film pressure, load capacity and squeezing time of the lubricant film have been discussed with clear graphical presentation for different values of parameters of pseudoplasticity and roughness. It was observed that the radial roughness decreases the film pressure, load capacity and squeezing time of lubricant, while increased values of these properties were observed for azimuthal roughness. It was also observed that the pseudoplastic lubricants decrease the film pressure and load capacity, while the dilatant lubricants increase these properties. Also, the variations in these results are highly significant.
Highlights
Study of squeeze film behaviour between two approaching surfaces is essential in many engineering applications and other allied areas
The combined effect of surface roughness and non-Newtonian lubricants on squeeze film characteristics between rough circular plates is presented on the basis of Rabinowitsch fluid model and Christensen’s roughness model
It is analysed that in comparison to the Newtonian lubricants, dimensionless film pressure, load carrying capacity and squeeze film time are smaller for pseudoplastic lubricants, while higher values of these properties are obtained for dilatant lubricants
Summary
Study of squeeze film behaviour between two approaching surfaces is essential in many engineering applications and other allied areas. The effects of non-Newtonian lubricants on various performance properties of squeeze film, annular disks and externally pressurized bearings have been studied by many researchers [1, 2]. Effects of non-Newtonian lubricants on the performance of porus thrust bearings was investigated by Walicka et al [5]. Adopted Rabinowitsch fluid model for theoretical investigation of performance properties of many film lubricated bearings in different lubrication regimes [8,9,10,11]. The properties of slider bearings lubricated with non-Newtonian Rabinowitsch type lubricants were studied by Hsu and Saibel and it was shown that the pressure distribution of pseudoplastic fluids decreases below that of Newtonian fluids [13]
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