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3 International Journal of Applied Mechanics and Engineering

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Thermal behaviour analysis of plain journal bearing influence of oil film viscosity on the journal characteristics

Michaud P., Souchet D.

International Journal of Applied Mechanics and Engineering

2005

Vol. 10, no spec

239-244

A numerical procedure is developped in order to analyse the " Tridimensional Thermohydrodynamic " behaviour of a bearing under static loading. The Reynolds equation, the energy equation in the film and the heat transfert equation in the solids are simultaneously solved using a Newton-Raphson procedure and the finite element modelisation. The numerical procedure developped incorporates a cavitation algorithm based on JFO model, which automatically predicts film rupture and reformation in the bearings. In the present study, the obtained results from this model are compared to experimentals results and numericals results from THD 2D model. The evolution of the thermal fields are presented and discussed. The comparisons showed that the THD 3D model with the cavitation algorithm is more performant than THD 2D model.

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.

The rheology and thermohydrodynamic analysis of non-Newtonian lubricant flows in a Rayleigh step

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

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no spec.

141-146

A finite element model is developed for parametric investigation of the influence of the rheological properties of the lubricant on the thermohydrodynamic film conditions which occur in a Rayleigh step bearing. The model is used to predict the thermohydrodynamic field in lubricating film with fixed geometry between the stationary and moving surfaces using power law fluids.