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Aeration in lubrication with application to drag torque reduction / Aphale, Chinar R. in Transactions of the ASME . Journal of tribology, Vol. 133 N° 3 (Juillet 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 133 N° 3 (Juillet 2011) . - 07 p. Titre : Aeration in lubrication with application to drag torque reduction Type de document : texte imprimé Auteurs : Aphale, Chinar R., Auteur ; Schultz, William W., Auteur ; Ceccio, Steven L., Auteur Année de publication : 2012 Article en page(s) : 07 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Contact  angle  Discs  (structures)  Drag  reduction  Fluids  Inclusions  Lubricating  oils  Lubrication  Plates  (structures)  Surface  tension  Two-phase  flow Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The aeration of an oil film flowing between the faces of two closely spaced circular plates (one stationary, and one rotating) is examined experimentally, numerically, and with an improved lubrication model. The gap between the plates is small compared to their radii, making lubrication theory appropriate for modeling the flow. However, standard lubrication boundary conditions suggested by Reynolds (1886, "On the Theory of Lubrication and its Application to Mr. Beauchamp Tower's Experiments, Including an Experimental Determination of the Viscosity of Olive Oil," Philos. Trans. R. Soc. London, 177, pp. 157-234) of p = 0 and pn = 0 (Dirichlet and Neumann conditions on pressure) at the gas-liquid interface do not allow for the inclusion of a contact line model, a phenomenon that is important in the inception of aeration. Hence, the standard theory does not adequately predict the experimentally observed onset of aeration. In the present work, we modify the Neumann boundary condition to include both interfacial tension effects and the dynamics of the interface contact angle. The resulting one-dimensional Cartesian two-phase model is formulated to incorporate the prescribed contact line condition and tracks the interface shape and its motion. This model is then implemented in an axisymmetric, two-dimensional model of the rotating disk flow and used to predict the onset of aeration for varying surface tension and static contact angles. The results of the modified lubrication model are compared with experimental observations and with a numerical computation of the aerating flow using a volume of fluid method. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Aeration in lubrication with application to drag torque reduction [texte imprimé] / Aphale, Chinar R., Auteur ; Schultz, William W., Auteur ; Ceccio, Steven L., Auteur . - 2012 . - 07 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 133 N° 3 (Juillet 2011) . - 07 p. Mots-clés : Contact  angle  Discs  (structures)  Drag  reduction  Fluids  Inclusions  Lubricating  oils  Lubrication  Plates  (structures)  Surface  tension  Two-phase  flow Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The aeration of an oil film flowing between the faces of two closely spaced circular plates (one stationary, and one rotating) is examined experimentally, numerically, and with an improved lubrication model. The gap between the plates is small compared to their radii, making lubrication theory appropriate for modeling the flow. However, standard lubrication boundary conditions suggested by Reynolds (1886, "On the Theory of Lubrication and its Application to Mr. Beauchamp Tower's Experiments, Including an Experimental Determination of the Viscosity of Olive Oil," Philos. Trans. R. Soc. London, 177, pp. 157-234) of p = 0 and pn = 0 (Dirichlet and Neumann conditions on pressure) at the gas-liquid interface do not allow for the inclusion of a contact line model, a phenomenon that is important in the inception of aeration. Hence, the standard theory does not adequately predict the experimentally observed onset of aeration. In the present work, we modify the Neumann boundary condition to include both interfacial tension effects and the dynamics of the interface contact angle. The resulting one-dimensional Cartesian two-phase model is formulated to incorporate the prescribed contact line condition and tracks the interface shape and its motion. This model is then implemented in an axisymmetric, two-dimensional model of the rotating disk flow and used to predict the onset of aeration for varying surface tension and static contact angles. The results of the modified lubrication model are compared with experimental observations and with a numerical computation of the aerating flow using a volume of fluid method. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]

The influence of grooves on the fully wetted and aerated flow between open clutch plates / Aphale, Chinar R. 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) . - 7 p. Titre : The influence of grooves on the fully wetted and aerated flow between open clutch plates Type de document : texte imprimé Auteurs : Aphale, Chinar R., Auteur ; Schultz, William W., Auteur ; Ceccio, Steven L., Auteur Année de publication : 2010 Article en page(s) : 7 p. Langues : Anglais (eng) Mots-clés : Clutches  Computational  fluid  dynamics  Drag  reduction  Friction  Lubricating  oils  Lubrication  Numerical  analysis,  shear  flow,  viscosity Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013200 [...] [article] The influence of grooves on the fully wetted and aerated flow between open clutch plates [texte imprimé] / Aphale, Chinar R., Auteur ; Schultz, William W., Auteur ; Ceccio, Steven L., Auteur . - 2010 . - 7 p. Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 132 N° 1 (Janvier 2010) . - 7 p. Mots-clés : Clutches  Computational  fluid  dynamics  Drag  reduction  Friction  Lubricating  oils  Lubrication  Numerical  analysis,  shear  flow,  viscosity Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013200 [...]