Documents disponibles écrits par cet auteur

Correction factor formula to predict the central and minimum film thickness for shear-thinning fluids in EHL / J. Y. Jang in Transactions of the ASME . Journal of tribology, Vol. 130 n°2 (Mars/Avril 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 n°2 (Mars/Avril 2008) . - 4 p. Titre : Correction factor formula to predict the central and minimum film thickness for shear-thinning fluids in EHL Type de document : texte imprimé Auteurs : J. Y. Jang, Auteur ; M. M. Khonsari, Auteur ; Scott Bair, Auteur Année de publication : 2008 Article en page(s) : 4 p. Note générale : Tribology Langues : Anglais (eng) En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468043 [article] Correction factor formula to predict the central and minimum film thickness for shear-thinning fluids in EHL [texte imprimé] / J. Y. Jang, Auteur ; M. M. Khonsari, Auteur ; Scott Bair, Auteur . - 2008 . - 4 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 n°2 (Mars/Avril 2008) . - 4 p. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468043

Normalized ashurst-hoover scaling and a comprehensive viscosity correlation for compressed liquids / Scott Bair in Transactions of the ASME . Journal of tribology, Vol. 134 N° 2 (Avril 2012) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 134 N° 2 (Avril 2012) . - 08 p. Titre : Normalized ashurst-hoover scaling and a comprehensive viscosity correlation for compressed liquids Type de document : texte imprimé Auteurs : Scott Bair, Auteur ; Arno Laesecke, Auteur Année de publication : 2012 Article en page(s) : 08 p. Note générale : tribology Langues : Anglais (eng) Mots-clés : elastohydrodynamic  lubrication;  thermoelastohydrodynamic  lubrication;  viscosity;  rheology;  lubricants Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The recent move toward physics-based elastohydrodynamics promises to yield advances in the understanding of the mechanisms of friction and film generation that were not possible a few years ago. However, the accurate correlation of the low-shear viscosity with temperature and pressure is an essential requirement. The Ashurst-Hoover thermodynamic scaling, which has been useful for thermal elastohydrodynamic simulation, is normalized here in a manner that maps the viscosity of three widely different liquids onto a master Stickel curve. The master curve can be represented by a combination of two exponential power law terms. These may be seen as expressions of different molecular interaction mechanisms similar to the two free-volume models of Batschinski-Hildebrand and Doolittle, respectively. The new correlation promises to yield more reasonable extrapolations to extreme conditions of temperature and pressure than free-volume models, and it removes the singularity that has prevented wide acceptance of free-volume models in numerical simulations. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000002 [...] [article] Normalized ashurst-hoover scaling and a comprehensive viscosity correlation for compressed liquids [texte imprimé] / Scott Bair, Auteur ; Arno Laesecke, Auteur . - 2012 . - 08 p. tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 134 N° 2 (Avril 2012) . - 08 p. Mots-clés : elastohydrodynamic  lubrication;  thermoelastohydrodynamic  lubrication;  viscosity;  rheology;  lubricants Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The recent move toward physics-based elastohydrodynamics promises to yield advances in the understanding of the mechanisms of friction and film generation that were not possible a few years ago. However, the accurate correlation of the low-shear viscosity with temperature and pressure is an essential requirement. The Ashurst-Hoover thermodynamic scaling, which has been useful for thermal elastohydrodynamic simulation, is normalized here in a manner that maps the viscosity of three widely different liquids onto a master Stickel curve. The master curve can be represented by a combination of two exponential power law terms. These may be seen as expressions of different molecular interaction mechanisms similar to the two free-volume models of Batschinski-Hildebrand and Doolittle, respectively. The new correlation promises to yield more reasonable extrapolations to extreme conditions of temperature and pressure than free-volume models, and it removes the singularity that has prevented wide acceptance of free-volume models in numerical simulations. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000002 [...]

A scaling parameter and function for the accurate correlation of viscosity with temperature and pressure across eight orders of magnitude of viscosity / Scott Bair in Transactions of the ASME . Journal of tribology, Vol. 130 N° 4 (Octobre 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 7 p. Titre : A scaling parameter and function for the accurate correlation of viscosity with temperature and pressure across eight orders of magnitude of viscosity Type de document : texte imprimé Auteurs : Scott Bair, Auteur ; Riccardo Casalini, Auteur Année de publication : 2015 Article en page(s) : 7 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Pressure  Temperature  Viscosity  Lubricants Résumé : Quantitative calculations of film thickness and friction in elastohydrodynamic lubrication will require that the low-shear viscosity, μ, be described with far greater accuracy than it is today. The free volume model has the advantage, over those currently used, of reproducing all of the trends that were known 80years ago, although not necessarily to experimental accuracy. A scaling parameter, φ∝TVγ, based on the repulsive intermolecular potential having exponent −3γ allows the viscosity to be written as a function of temperature, T, and volume, V, only, as μ=F(φ). The appropriate function for lubricants appears to be a Vogel-like form, μ∝exp(BFφ∞∕(φ−φ∞)). Parameters are presented here for seven liquids. When the dynamic crossover is present, two such functions are required. A low molecular weight dimethyl silicone having high compressibility is an exception. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468128 [article] A scaling parameter and function for the accurate correlation of viscosity with temperature and pressure across eight orders of magnitude of viscosity [texte imprimé] / Scott Bair, Auteur ; Riccardo Casalini, 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 : Pressure  Temperature  Viscosity  Lubricants Résumé : Quantitative calculations of film thickness and friction in elastohydrodynamic lubrication will require that the low-shear viscosity, μ, be described with far greater accuracy than it is today. The free volume model has the advantage, over those currently used, of reproducing all of the trends that were known 80years ago, although not necessarily to experimental accuracy. A scaling parameter, φ∝TVγ, based on the repulsive intermolecular potential having exponent −3γ allows the viscosity to be written as a function of temperature, T, and volume, V, only, as μ=F(φ). The appropriate function for lubricants appears to be a Vogel-like form, μ∝exp(BFφ∞∕(φ−φ∞)). Parameters are presented here for seven liquids. When the dynamic crossover is present, two such functions are required. A low molecular weight dimethyl silicone having high compressibility is an exception. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468128