Abstract
In the present study, the static characteristics of hydrodynamic circular journal bearings of finite length are highlighted, using the combined influences of textured surface and non-Newtonian lubricants behavior, obeying to the Rabinowitsch fluid model. The associated nonlinear Rabinowitsch-Reynolds equation has been discretized using finite differences scheme and solved by the mean of Elrod’s algorithm taking into account the presence of cylindrical textures on full/optimum bearing surface. Following to the absence of textures on the bearing surface or the non-Newtonian fluid behavior, the obtained results are in good agreement with the reference ones. The hydrodynamic lubrication static performances are computed for various parameters such as textures location; eccentricity ratio and the rheological coeffcient. The results suggest that texturing the bearing’s convergent zone enhances significantly the load carrying capacity and reduces the friction coeffcient, whereas texturing the full bearing surface may leads to bad performances. It is also noticed that the pseudoplastic lubricant coeffcient decreases the bearing performances (load capacity and pressure) compared to Newtonian fluid cases. Considering the optimal arrangement of textures on the contact surface, a significant improvement in terms of load capacity and friction can be achieved, especially at low pseudoplasticity effect.
Highlights
Fluid film journal bearings are nowadays extensively used in heavy rotating machineries
A computer program was developed to investigate the static performances of hydrodynamic finite textured journal bearing, using pseudo-plastic lubricants which obeys to Rabinowitsch fluid model
For textured journal bearings lubricated with Newtonian fluid, the comparison results are presented in table 2
Summary
Fluid film journal bearings are nowadays extensively used in heavy rotating machineries. They widely employed, in adverse industrial conditions, due to their wide ranges of loadcarrying ability to support heavy loads, especially at high operating parameters [1]. Bearing systems must be designed to operate under different loads, speeds and environments with high performances and minimal noise and vibration. 2.1 Modified Reynolds equation and Elrod cavitation algorithm. For an in-compressible fluid, in steady state laminar flow, under the isothermal condition, the nonlinear mass conservative form of Rabinowitsch-Reynolds equation (in Cartesian coordinates) can be expressed as follows : ∂ ∂θ h3 12 g β ∂Θ ∂θ + α h5 80 g 3 + R L ∂ ∂Z ∂Θ ∂Z
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