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

Elastohydrodynamic line-contact of compressible shear thinning fluids with consideration of the surface roughness / J. Y. Jang in Transactions of the ASME . Journal of tribology, Vol. 132 N° 3 (Juillet 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 132 N° 3 (Juillet 2010) . - 06 p. Titre : Elastohydrodynamic line-contact of compressible shear thinning fluids with consideration of the surface roughness Type de document : texte imprimé Auteurs : J. Y. Jang, Auteur ; M. M. Khonsari, Auteur Année de publication : 2011 Article en page(s) : 06 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Crystallographic  shear  Elastic  deformation  Hydrodynamics  Lubrication  Surface  roughness  Viscosity Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Applications involving highly loaded elastohydrodynamic lubrication (EHL), particularly when the lubricant experiences shear thinning, operating with small film thicknesses may necessitate consideration of surface asperities. A modified Reynolds equation with provision for surface roughness and shear thinning is treated to predict the pressure and surface asperity effect in an EHL line-contact. The unknown in the Reynolds equation is the hydrodynamic pressure instead of the total pressure to ensure that the pressure boundary condition at the outlet is properly posed. The Carreau viscosity model is used for characterizing the shear thinning behavior, Patir and Cheng flow factors for taking into the influence of roughness on the lubricating film, and Greenwood–Trip for determination of pressure at the asperity level. The modified Reynolds equation is solved for the hydrodynamic pressure instead of the total pressure with appropriately defined boundary conditions. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Elastohydrodynamic line-contact of compressible shear thinning fluids with consideration of the surface roughness [texte imprimé] / J. Y. Jang, Auteur ; M. M. Khonsari, Auteur . - 2011 . - 06 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 132 N° 3 (Juillet 2010) . - 06 p. Mots-clés : Crystallographic  shear  Elastic  deformation  Hydrodynamics  Lubrication  Surface  roughness  Viscosity Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Applications involving highly loaded elastohydrodynamic lubrication (EHL), particularly when the lubricant experiences shear thinning, operating with small film thicknesses may necessitate consideration of surface asperities. A modified Reynolds equation with provision for surface roughness and shear thinning is treated to predict the pressure and surface asperity effect in an EHL line-contact. The unknown in the Reynolds equation is the hydrodynamic pressure instead of the total pressure to ensure that the pressure boundary condition at the outlet is properly posed. The Carreau viscosity model is used for characterizing the shear thinning behavior, Patir and Cheng flow factors for taking into the influence of roughness on the lubricating film, and Greenwood–Trip for determination of pressure at the asperity level. The modified Reynolds equation is solved for the hydrodynamic pressure instead of the total pressure with appropriately defined boundary conditions. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]

On the behavior of misaligned journal bearings based on mass-conservative thermohydrodynamic analysis / J. Y. Jang in Transactions of the ASME . Journal of tribology, Vol. 132 N° 1 (Janvier 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 132 N° 1 (Janvier 2010) . - 13 p. Titre : On the behavior of misaligned journal bearings based on mass-conservative thermohydrodynamic analysis Type de document : texte imprimé Auteurs : J. Y. Jang, Auteur ; M. M. Khonsari, Auteur Année de publication : 2010 Article en page(s) : 13 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Cavitation  Convection  Fracture  Liquid  films  Machine  bearings Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Misalignment affects nearly all the bearing performance parameters including the cavitation, thermal field, leakage flow-rate, and moments. The present paper provides a comprehensive analysis of misaligned journal bearings based on a three-dimensional mass-conservative thermohydrodynamic model that appropriately takes into account the film rupture and reformation. An extensive set of numerical solutions are presented to closely examine the effects of misalignment in journal bearings. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] On the behavior of misaligned journal bearings based on mass-conservative thermohydrodynamic analysis [texte imprimé] / J. Y. Jang, Auteur ; M. M. Khonsari, Auteur . - 2010 . - 13 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 132 N° 1 (Janvier 2010) . - 13 p. Mots-clés : Cavitation  Convection  Fracture  Liquid  films  Machine  bearings Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Misalignment affects nearly all the bearing performance parameters including the cavitation, thermal field, leakage flow-rate, and moments. The present paper provides a comprehensive analysis of misaligned journal bearings based on a three-dimensional mass-conservative thermohydrodynamic model that appropriately takes into account the film rupture and reformation. An extensive set of numerical solutions are presented to closely examine the effects of misalignment in journal bearings. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]

Three-dimensional thermohydrodynamic analysis of a wet clutch with consideration of grooved friction surfaces / J. Y. Jang in Transactions of the ASME . Journal of tribology, Vol. 133 N° 1 (Janvier 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 133 N° 1 (Janvier 2011) . - 12 p. Titre : Three-dimensional thermohydrodynamic analysis of a wet clutch with consideration of grooved friction surfaces Type de document : texte imprimé Auteurs : J. Y. Jang, Auteur ; M. M. Khonsari, Auteur ; Rikard Maki, Auteur Année de publication : 2012 Article en page(s) : 12 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Clutches  Convection  Cooling  Friction  Heat  transfer  Permeability Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A model is developed to investigate the effect of radial grooves and waffle-shape grooves on the performance of a wet clutch. Three-dimensional formulation of the governing equations, boundary conditions, and numerical solution scheme are presented for modeling the thermal aspects of the engagement process in a wet clutch. The thermal model includes full consideration of the viscous heat dissipation in the fluid as well as heat transfer into the separator, the friction material, and the core disk. The convective terms in the energy equations for the oil as well as the heat conduction equations in the bounding solids are properly formulated to determine the temperature fields corresponding to the domains between grooves. Roughness, centrifugal force, deformability, and permeability of the friction material with grooves are taken into account. The effects of groove geometry such as groove depth, grooved area, and number of grooves on the engagement characteristic of a wet clutch are investigated. It is also shown that the thermal effects in a wet clutch influence the engagement time and the torque response and should be included in the analytical studies. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Three-dimensional thermohydrodynamic analysis of a wet clutch with consideration of grooved friction surfaces [texte imprimé] / J. Y. Jang, Auteur ; M. M. Khonsari, Auteur ; Rikard Maki, Auteur . - 2012 . - 12 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 133 N° 1 (Janvier 2011) . - 12 p. Mots-clés : Clutches  Convection  Cooling  Friction  Heat  transfer  Permeability Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A model is developed to investigate the effect of radial grooves and waffle-shape grooves on the performance of a wet clutch. Three-dimensional formulation of the governing equations, boundary conditions, and numerical solution scheme are presented for modeling the thermal aspects of the engagement process in a wet clutch. The thermal model includes full consideration of the viscous heat dissipation in the fluid as well as heat transfer into the separator, the friction material, and the core disk. The convective terms in the energy equations for the oil as well as the heat conduction equations in the bounding solids are properly formulated to determine the temperature fields corresponding to the domains between grooves. Roughness, centrifugal force, deformability, and permeability of the friction material with grooves are taken into account. The effects of groove geometry such as groove depth, grooved area, and number of grooves on the engagement characteristic of a wet clutch are investigated. It is also shown that the thermal effects in a wet clutch influence the engagement time and the torque response and should be included in the analytical studies. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]