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2 International Journal of Applied Mechanics and Engineering

2 2005

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Effects of a Rayleigh step aspect ratio on the thermohydrodynamic behavior of power law lubricant flows

Jeddi L., Bonneau D., El Khlifi M.

International Journal of Applied Mechanics and Engineering

2005

Vol. 10, no spec

233-238

The thermohydrodynamic behavior of the lubricant flow in a Rayleigh step is described by a mathematical model that uses the bidimensional Navier-Stokes and energy equations written in terms of the primary variables u, v, p and T. The non-Newtonian behavior of the lubricant is described by a power law model. The lubricant is assumed to be incompressible and the process is steady-state and laminar. The equations are solved simultaneously using the incremental load method associated with the Newton-Raphson method and the finite element formulation. The effects of a Rayleigh step aspect ratio on the velocities, pressure and temperature patterns for different power law index are investigated.

Analysis of tilting pads thrust bearings behavior lubricated by power law fluid

Souchet D., Bouyahia F., Hajjam M., El Khlifi M.

International Journal of Applied Mechanics and Engineering

2005

Vol. 10, no spec

297-302

The numerical modeling of non-Newtonian lubricant flows in titling pads thrust bearing is developed to predict some interesting factors in industrial view point. It means parameters such as load, friction and power loss whose evaluation contributes strongly to improve the design and performances of the titling pads thrust bearing. The non-Newtonian rheological model chosen is the power law because of its large domain of use. The dynamic field is described through the resolution of the generalized Reynolds equation and the thermal effects, due to the lubricant shearing, is taken into account through a global thermal balance. The discretisation of equations is made by the finite differences scheme.