Hydrodynamic lubrication study of plain journal bearings lubricated with couple stress fluids: surface texture effects

Atika Kabouya; Ali Belhamra

doi:10.5802/crmeca.347

Article de recherche

Hydrodynamic lubrication study of plain journal bearings lubricated with couple stress fluids: surface texture effects
[Étude de la lubrification hydrodynamique des paliers lisses lubrifiée à l’aide de fluide a couple de contrainte : effets de texturation des surfaces]

Atika Kabouya ¹ ; Ali Belhamra ¹

¹Electro Mechanics Department, Electromechanical Systems Laboratory, Faculty of Technology, University Badji Mokhtar, 12, PO Box, Annaba, 23000, Algeria

Comptes Rendus. Mécanique, Volume 354 (2026), pp. 71-87

Abstract (VO)
Résumé

This study investigates the static characteristic of textured bearings lubricated with oils containing viscosity additives, thus influencing their tribological performance. The texture model adopted is that of the positive sinusoidal half-wave, a configuration that enables lubrication to be optimized by modifying the distribution of the fluid film. The lubricant used has a non-Newtonian rheological behavior, and is modeled as a couple stress fluids, taking into account the effects of fluid microstructure on flow.

The results obtained are analyzed by comparing them with those of a plain bearing lubricated by a conventional Newtonian fluid, enabling the influence of the lubricant’s texturing and properties on bearing performance to be assessed. It is shown that the combination of the surface texturing of the pad and lubrication with polar fluids has significant effects on the static characteristics of the journal bearing, such as: load-carrying capacity, friction factor, attitude angle, and side leakage flow. It is also found that the sensitivity of these effects increases with the couple stress parameter and the eccentricity ratio.

Cette étude porte sur le comportement statique d’un palier texturé lubrifié à l’aide d’huiles contenant des additifs de viscosité, influençant ainsi ses performances tribologiques. Le modèle de texture adopté est celui de demi-onde sinusoïdale positive, une configuration permettant d’optimiser la lubrification en modifiant la répartition du film fluide. Le lubrifiant utilisé présente un comportement rhéologique non newtonien et est modélisé comme un fluide à couples de contraintes, en considérant les effets de la microstructure du fluide sur l’écoulement.

Les résultats obtenus sont analysés en les comparants à ceux d’un palier lisse lubrifié par un fluide newtonien classique, ce qui permet d’évaluer l’influence de la texturation et des propriétés du lubrifiant sur les performances du palier. Il est démontré que la combinaison de la texturation de surface du coussinet et la lubrification à l’aide de fluides polaires a des effets significatifs sur les caractéristiques statiques du palier, tels que : la portance hydrodynamique, le nombre de frottement, l’angle de calage et le débit. Il est également constaté que la sensibilité de ces effets augmente avec le paramètre de couple de contrainte et l’excentricité relative.

Reçu le : 2025-03-15
Révisé le : 2025-07-24
Accepté le : 2026-01-20
Publié le : 2026-02-05

DOI : 10.5802/crmeca.347

Keywords: Hydrodynamic lubrication, Hydrodynamic bearing, Couple stress fluid, Non-Newtonian fluid, Surface texture
Mots-clés : Lubrification hydrodynamique, Palier hydrodynamique, Fluide à couples de contraintes, Fluide non Newtonien, Texturation de surface

Affiliations des auteurs :

Atika Kabouya ¹ ; Ali Belhamra ¹

¹ Electro Mechanics Department, Electromechanical Systems Laboratory, Faculty of Technology, University Badji Mokhtar, 12, PO Box, Annaba, 23000, Algeria

Licence :

CC-BY 4.0

Droits d'auteur : Les auteurs conservent leurs droits

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     title = {Hydrodynamic lubrication study of plain journal bearings lubricated with couple stress fluids: surface texture effects},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {71--87},
     year = {2026},
     publisher = {Acad\'emie des sciences, Paris},
     volume = {354},
     doi = {10.5802/crmeca.347},
     language = {en},
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Atika Kabouya; Ali Belhamra. Hydrodynamic lubrication study of plain journal bearings lubricated with couple stress fluids: surface texture effects. Comptes Rendus. Mécanique, Volume 354 (2026), pp. 71-87. doi: 10.5802/crmeca.347

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