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Auteur Punit Kumar |
Documents disponibles écrits par cet auteur (2)



Combined effects of shear thinning and viscous heating on EHL characteristics of rolling/sliding line contacts / Punit Kumar in Transactions of the ASME . Journal of tribology, Vol. 130 N° 4 (Octobre 2008)
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[article]
Titre : Combined effects of shear thinning and viscous heating on EHL characteristics of rolling/sliding line contacts Type de document : texte imprimé Auteurs : Punit Kumar, Auteur ; M. M. Khonsari, Auteur Année de publication : 2015 Article en page(s) : 13 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Temperature Fluids Lubricants Shear (Mechanics) Equations Film thickness Heating Stress Pressure Viscosity Résumé : The combined influence of shear thinning and viscous heating on the behavior of film thickness and friction in elastohydrodynamic lubrication (EHL) rolling/sliding line contacts is investigated numerically. The constitutive equation put forward by Carreau is incorporated into the model to describe shear thinning. An extensive set of numerical simulations is presented. Comparison of the film thickness predictions with published experiments reveals good agreement, and it is shown that thermal effect plays an important role in the precise estimation of EHL film thickness and friction coefficient. Parametric simulations show that thermal effect in shear-thinning fluids is strongly affected by the power-law index used in the Carreau equation. Comparisons of prediction of the Newtonian fluid model are presented to quantify the degree to which it overestimates the film thickness. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468111
in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 13 p.[article] Combined effects of shear thinning and viscous heating on EHL characteristics of rolling/sliding line contacts [texte imprimé] / Punit Kumar, Auteur ; M. M. Khonsari, Auteur . - 2015 . - 13 p.
Tribology
Langues : Anglais (eng)
in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 13 p.
Mots-clés : Temperature Fluids Lubricants Shear (Mechanics) Equations Film thickness Heating Stress Pressure Viscosity Résumé : The combined influence of shear thinning and viscous heating on the behavior of film thickness and friction in elastohydrodynamic lubrication (EHL) rolling/sliding line contacts is investigated numerically. The constitutive equation put forward by Carreau is incorporated into the model to describe shear thinning. An extensive set of numerical simulations is presented. Comparison of the film thickness predictions with published experiments reveals good agreement, and it is shown that thermal effect plays an important role in the precise estimation of EHL film thickness and friction coefficient. Parametric simulations show that thermal effect in shear-thinning fluids is strongly affected by the power-law index used in the Carreau equation. Comparisons of prediction of the Newtonian fluid model are presented to quantify the degree to which it overestimates the film thickness. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468111 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire EHL circular contact film thickness correction factor for shear-thinning fluids / Punit Kumar in Transactions of the ASME . Journal of tribology, Vol. 130 N° 4 (Octobre 2008)
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[article]
Titre : EHL circular contact film thickness correction factor for shear-thinning fluids Type de document : texte imprimé Auteurs : Punit Kumar, Auteur ; M. M. Khonsari, Auteur Année de publication : 2015 Article en page(s) : 7 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Fluids Shear (Mechanics) Equations Film thickness Lubricants Engineering simulation Pressure Résumé : An extensive set of full elastohydrodynamic lubrication point contact simulations has been used to develop correction factors to account for the effect of shear-thinning lubricant behavior on the central and minimum film thickness in circular contacts under pure rolling condition. The film thickness for a shear-thinning lubricant can be easily obtained by dividing the corresponding Newtonian film thickness by the appropriate correction factor. Comparisons of the film thickness values obtained using the correction factors have been matched with the published experimental results pertaining to shear-thinning lubricants with a variety of realistic flow and piezoviscous properties under a wide range of operating speed. The good agreement between them establishes the validity and versatility of the correction factors developed in this paper. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468112
in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 7 p.[article] EHL circular contact film thickness correction factor for shear-thinning fluids [texte imprimé] / Punit Kumar, Auteur ; M. M. Khonsari, Auteur . - 2015 . - 7 p.
Tribology
Langues : Anglais (eng)
in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 7 p.
Mots-clés : Fluids Shear (Mechanics) Equations Film thickness Lubricants Engineering simulation Pressure Résumé : An extensive set of full elastohydrodynamic lubrication point contact simulations has been used to develop correction factors to account for the effect of shear-thinning lubricant behavior on the central and minimum film thickness in circular contacts under pure rolling condition. The film thickness for a shear-thinning lubricant can be easily obtained by dividing the corresponding Newtonian film thickness by the appropriate correction factor. Comparisons of the film thickness values obtained using the correction factors have been matched with the published experimental results pertaining to shear-thinning lubricants with a variety of realistic flow and piezoviscous properties under a wide range of operating speed. The good agreement between them establishes the validity and versatility of the correction factors developed in this paper. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468112 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire