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Theoretical study of static and dynamic characteristics for eccentric cylinders lubricated with ferrofluid / Kadry Zakaria in Transactions of the ASME . Journal of tribology, Vol. 133 N° 2 (Avril 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 133 N° 2 (Avril 2011) . - 18 p. Titre : Theoretical study of static and dynamic characteristics for eccentric cylinders lubricated with ferrofluid Type de document : texte imprimé Auteurs : Kadry Zakaria, Auteur ; Magdy A. Sirwah, Auteur ; M. Fakharany, Auteur Année de publication : 2012 Article en page(s) : 18 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Lubricants  Lubrication  Machine  bearings  Magnetic  fluids  Magnetohydrodynamics  Non-Newtonian  flow  Non-newtonian  fluids  Shapes  (structures) Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The aim of this study is to explore the static and dynamic performance characteristics of finite journal bearings lubricated with a non-Newtonian ferrofluid in the presence of an external magnetic field using the spectral method technique. The modified Reynolds equation governing the film pressure, coming out from the combination of the momentum and continuity equations, is derived. We use the pressure distribution function to study the static and dynamic characteristics and the stability of the given system. Numerical applications are achieved in order to investigate the influence of the various parameters on the stability behavior of the system. For instance, it is observed that the journal loci get stable as the magnetic force increases. The non-Newtonian, the distance ratio, and the magnetic parameters play an important role in administrating the stability behavior. The non-Newtonian parameter is found to stabilize the system, while the magnetic force coefficient destabilizes it. Furthermore, for law eccentricity ratios, the stability of this system is significant. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Theoretical study of static and dynamic characteristics for eccentric cylinders lubricated with ferrofluid [texte imprimé] / Kadry Zakaria, Auteur ; Magdy A. Sirwah, Auteur ; M. Fakharany, Auteur . - 2012 . - 18 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 133 N° 2 (Avril 2011) . - 18 p. Mots-clés : Lubricants  Lubrication  Machine  bearings  Magnetic  fluids  Magnetohydrodynamics  Non-Newtonian  flow  Non-newtonian  fluids  Shapes  (structures) Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The aim of this study is to explore the static and dynamic performance characteristics of finite journal bearings lubricated with a non-Newtonian ferrofluid in the presence of an external magnetic field using the spectral method technique. The modified Reynolds equation governing the film pressure, coming out from the combination of the momentum and continuity equations, is derived. We use the pressure distribution function to study the static and dynamic characteristics and the stability of the given system. Numerical applications are achieved in order to investigate the influence of the various parameters on the stability behavior of the system. For instance, it is observed that the journal loci get stable as the magnetic force increases. The non-Newtonian, the distance ratio, and the magnetic parameters play an important role in administrating the stability behavior. The non-Newtonian parameter is found to stabilize the system, while the magnetic force coefficient destabilizes it. Furthermore, for law eccentricity ratios, the stability of this system is significant. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]