A Film Thickness Correction Formula for Double- Newtonian Shear-Thinning in Rolling EHL Circular Contacts

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dc.contributor.author Habchi, Wassim
dc.contributor.author Bair, S.
dc.contributor.author Qureshi, F.
dc.contributor.author Covitch, M.
dc.date.accessioned 2015-09-21T08:09:59Z
dc.date.available 2015-09-21T08:09:59Z
dc.date.copyright 2013
dc.date.issued 2015-09-21
dc.identifier.issn 1023-8883 en_US
dc.identifier.uri http://hdl.handle.net/10725/2178
dc.description.abstract Lubricants which contain a polymeric thickener will often display a second Newtonian plateau in measured flow curves. Like other manifestations of shear-dependent viscosity, this shear response will lead to an inaccurate prediction when the classical film-thickness formulas are employed. A correction formula has been developed from numerical experiments for a range of parameters of the double-Newtonian modified Carreau equation. The parameters of this shear-thinning model were selected from measurements for real lubricants obtained in Couette viscometers and a capillary viscometer. In addition, a full EHL film thickness formula has been derived from the same numerical experiments. The correction formula and the full formula were successfully validated using published film thickness data and published viscosity data for an EHL reference liquid, a polymer solution. Clearly, viscometer measurements of shear-dependent viscosity which contain the inflection leading to the second Newtonian are essential for a film-thickness calculation when a high-molecular-weight component of the lubricant is present. en_US
dc.language.iso en en_US
dc.title A Film Thickness Correction Formula for Double- Newtonian Shear-Thinning in Rolling EHL Circular Contacts en_US
dc.type Article en_US
dc.description.version N/A en_US
dc.author.school SOE en_US
dc.author.idnumber 200804200
dc.author.woa N/A en_US
dc.author.department Mechanical Engineering en_US
dc.description.embargo N/A en_US
dc.relation.journal Tribology Letters en_US
dc.journal.volume 50 en_US
dc.journal.issue 1 en_US
dc.article.pages 59-66 en_US
dc.keywords Elastohydrodynamic en_US
dc.keywords Film thickness en_US
dc.keywords Non-Newtonian en_US
dc.keywords Rheology en_US
dc.keywords Pressure-viscosity coefficient en_US
dc.identifier.doi http://dx.doi.org/10.1007/s11249-012-0078-6 en_US
dc.identifier.ctation Habchi, W., Bair, S., Qureshi, F., & Covitch, M. (2013). A film thickness correction formula for double-Newtonian shear-thinning in rolling EHL circular contacts. Tribology Letters, 50(1), 59-66. en_US
dc.author.email wassim.habchi@lau.edu.lb
dc.identifier.url http://link.springer.com/article/10.1007/s11249-012-0078-6

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