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International Journal of Fluid Mechanics Research

年間 6 号発行

ISSN 印刷: 2152-5102

ISSN オンライン: 2152-5110

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.1 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.0002 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.33 SJR: 0.256 SNIP: 0.49 CiteScore™:: 2.4 H-Index: 23

Indexed in

Model of Elastohydrodynamic Lubrication with Molecularly Thin Lubricating Films. Part I: Development of Analysis

巻 30, 発行 5, 2003, 16 pages
DOI: 10.1615/InterJFluidMechRes.v30.i5.70
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要約

This paper develops an analysis for study of hydrodynamic lubrication in smooth line contacts at isothermal and steady state conditions where molecularly thin lubricating films occur, taking into account the elastic deformation of the contact surfaces. Considering the lubricant's rheology within molecularly thin film of a lubricant measured by recent experiments [1], the Reynolds equation in the present study is based on the non-Newtonian viscoplastic lubricant rheological model by Zhang and Lu [2], incorporating the lubricant's viscosity, the shear modulus of elasticity, shear strength, contact-lubricant interfacial shear strength, and Eyring stress of the lubricant. The mentioned model is valid not only for thick lubricant films, but also can be extended to molecularly thin lubricant films, for which the parameters characterizing the lubricant's property are respectively expressed as functions of the pressure and the thickness of the lubricant film. It can be used for wide operational scopes where shear thinning, slip and elastic behavior effects of the lubricant may occur significant. These effects may be important in hydrodynamic lubrication where the lubricant film is molecularly thin. A hydrodynamic pressure is derived from the Reynolds equation. The effect of the flow factor proposed by Zhang and Tang [13], which occurs due to inhomogeneity and discontinuity of the lubricant across its film thickness for molecularly thin film lubrication, is incorporated in the present study. The effect of the surface pressure (i. e., Van der Waals and solvation pressures) is also considered. These last influence carried load of the contact and the lubricant film thickness, respectively, by acting on the contact surfaces and changing the elastic deformation of the contact surfaces. The total pressure in the contact is obtained by summation of hydrodynamic and the surface pressures.

によって引用された
  1. Zhang Yongbin, Boundary film shear elastic modulus effect in hydrodynamic contact. Part I: theoretical analysis and typical solution, Theoretical and Computational Fluid Dynamics, 23, 4, 2009. Crossref

  2. Zhang Yongbin, Study of an Engineering Mixed Contact: Part I-Theoretical Analysis, Journal of Applied Sciences, 7, 9, 2007. Crossref

  3. Zhang Yongbin, Flow factor approach to molecularly thin hydrodynamic film lubrication, Journal of Molecular Liquids, 128, 1-3, 2006. Crossref

  4. Zhang Yongbin, Boundary lubrication—An important lubrication in the following time, Journal of Molecular Liquids, 128, 1-3, 2006. Crossref

  5. Zhang Yongbin, Contact–fluid interfacial slippage in hydrodynamic lubricated contacts, Journal of Molecular Liquids, 128, 1-3, 2006. Crossref

  6. Zhang Yongbin, Novel nano bearings constructed by physical adsorption, Scientific Reports, 5, 1, 2015. Crossref

  7. Zhang Y., How does dry contact occur in elastohydrodynamic lubrication?, Industrial Lubrication and Tribology, 57, 5, 2005. Crossref

  8. Zhang Y., A justification of the load‐carrying capacity of elastohydrodynamic lubrication film based on the Newtonian fluid model, Industrial Lubrication and Tribology, 57, 6, 2005. Crossref

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