Abstract
The present numerical study investigates the combined effect of micro-texture and magneto hydrodynamic lubrication behaviour on the performance of EHL line contact. Micro-textures are provided in the inlet zone of contacting surface has been studied. Modified Reynolds equation, elasticity equation and load balance equation has been solved using FEA and Generalized Minimal Residual Method (GMRES). A parametric study has been performed to optimize the micro-texture shapes in the contacting surfaces for different values of magneto hydrodynamic lubricant parameters The numerical results show that increasing externally applied magnetic field and micro- texture shapes enhances the values of performance parameter of EHL line contact. Finally, the variation in the steady-state EHL characteristics pertaining to unidirectional pure sliding contacts due to an artificially produced IZMTS is investigated numerically. The enhancement in central and minimum film thickness is found to be upto 38% and 28% respectively along with 33.28% reduction in coefficient of friction.
Highlights
Elastohydrodynamic lubrication (EHL) is a special form of hydrodynamic lubrication involving extremely high contact pressures leading to substantial increase in lubricant viscosity along with significant elastic deformation of surfaces
The study of electrical conducting lubricant in the presence of a magnetic field is categorized as magneto hydro dynamics (MHD) or hydro-magnetics
These validations with different studies justify the computer program which was developed in the present work, and shows it is applicable for conventional EHL as well as textured EHL line contact operated with MHD lubricant
Summary
Elastohydrodynamic lubrication (EHL) is a special form of hydrodynamic lubrication involving extremely high contact pressures leading to substantial increase in lubricant viscosity along with significant elastic deformation of surfaces. The lubricant used in the system has isothermal, electrically conducting and incompressible fluid properties This system is exposed to transverse magnetic fields by making a constant current flow through the coaxial cables (which act as a solenoid) when on the power source is switched on. Boundary conditions used for solving Reynolds equation are as follows: At inlet: P = 0 at P = Xin. The elasticity equation gives the shape of the lubricant film, which includes the elastic deformation for a given pressure distribution (Jin and Dowson, 1997). The governing equations are solved to obtain pressure distribution and film shape which is used to evaluate the coefficient of friction and is expressed in the dimensionless form (Kumar et al, 2008) as:. Using Gaussian quadrature, force balance equation can be written as: pei Nie|J|w −
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