Abstract
The present study investigates the load capacity and friction coefficient for a two-layered journal bearing lubricated with ferrofluid. A modified Reynolds equation for a two-layered ferrofluid is derived using displaced infinitely long wire magnetic field model. Reynolds boundary conditions are used to obtain nondimensional pressure and shear stress expressions. Nondimensional load capacity and coefficient of friction are analyzed under the influence of lubricant layer’s thickness, viscosities, magnetic field intensity and distance ratio parameter. Ferrofluid lubrication under the influence of magnetic field has potential to enhance load carrying capacity and reduce coefficient of friction for two-layered journal bearing.
Highlights
Ferrofluids are stable colloidal suspension comprising ferromagnetic particles dispersed within a carrier fluid
The nondimensional load capacity increases with increase in magnetic field intensity (α) due to increase of pressure around the location of wire (θ=π/2)
The coefficient of friction (Cf) in the two-layered lubricant film journal bearing lubricated with ferrofluid is shown in Figs. 3a-3b for γ=0.9 and β=10
Summary
Ferrofluids are stable colloidal suspension comprising ferromagnetic particles dispersed within a carrier fluid. Osman et al [1] derived modified Reynolds equation applicable for external applied magnetic field. Osman et al [2] investigated the influence of ferrofluid on the static and dynamic characteristics of the finite hydrodynamic journal bearing under an applied magnetic field. Szeri [4] analyzed the journal bearing with two-layered film bearing that combines the advantages of high viscosity with low viscosity lubricant. Tichy [5] developed a modified Reynolds equation for analysis of journal bearing with surface layers of higher viscosity. Rao et al [6] investigated the generation of load support and consequent reduction in friction in a two-layered lubricant film journal bearing under the influence of partial slip configuration
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