دورية أكاديمية
The Non-Unicity of the Film Thickness in the Hydrodynamic Lubrication: Novel Approach Generating Equivalent Micro-Grooves and Roughness
| العنوان: | The Non-Unicity of the Film Thickness in the Hydrodynamic Lubrication: Novel Approach Generating Equivalent Micro-Grooves and Roughness |
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| المؤلفون: | M. El Gadari, M. Hajjam |
| المصدر: | International Journal of Applied Mechanics and Engineering, Vol 26, Iss 3, Pp 44-61 (2021) |
| بيانات النشر: | University of Zielona Góra, 2021. |
| سنة النشر: | 2021 |
| المجموعة: | LCC:Mechanical engineering and machinery |
| مصطلحات موضوعية: | reynolds equation, inverse theory, macro-shape, micro-texture, cavitation, lifting force, friction force, flow rate, Mechanical engineering and machinery, TJ1-1570 |
| الوصف: | Since the 1960s, all studies have assumed that a film thickness “ h ” provides a unique pressure field “ p ” by resolving the Reynolds equation. However, it is relevant to investigate the film thickness unicity under a given hydrodynamic pressure within the inverse theory. This paper presents a new approach to deduce from an initial film thickness a widespread number of thicknesses providing the same hydrodynamic pressure under a specific condition of gradient pressure. For this purpose, three steps were presented: 1) computing the hydrodynamic pressure from an initial film thickness by resolving the Reynolds equation with Gümbel’s cavitation model, 2) using a new algorithm to generate a second film thickness, 3) comparing and validating the hydrodynamic pressure produced by both thicknesses with the modified Reynolds equation. Throughout three surface finishes: the macro-shaped, micro-textured, and rough surfaces, it has been demonstrated that under a specific hydrodynamic pressure gradient, several film thicknesses could generate the same pressure field with a slight difference by considering cavitation. Besides, this paper confirms also that with different ratios of the averaged film thickness to the root mean square (RMS) similar hydrodynamic pressure could be generated, thereby the deficiency of this ratio to define the lubrication regime as commonly known from Patir and Cheng theory. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1734-4492 2353-9003 |
| Relation: | https://www.ijame-poland.com/The-Non-Unicity-of-the-Film-Thickness-in-the-Hydrodynamic-Lubrication-Novel-Approach,166763,0,2.html; https://doaj.org/toc/1734-4492; https://doaj.org/toc/2353-9003 |
| DOI: | 10.2478/ijame-2021-0034 |
| URL الوصول: | https://doaj.org/article/260a1bbd19a34a02a89058da68693418 |
| رقم الأكسشن: | edsdoj.260a1bbd19a34a02a89058da68693418 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 17344492 23539003 |
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| DOI: | 10.2478/ijame-2021-0034 |