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Träfflista för sökning "WFRF:(Tsandzana Afonso Fernando) srt2:(2017)"

Search: WFRF:(Tsandzana Afonso Fernando) > (2017)

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1.
  • Fabricius, John, et al. (author)
  • A Comparison of the Roughness Regimes in Hydrodynamic Lubrication
  • 2017
  • In: Journal of tribology. - : The American Society of Mechanical Engineers (ASME). - 0742-4787 .- 1528-8897. ; 139:5
  • Journal article (peer-reviewed)abstract
    • This work relates to previous studies concerning the asymptotic behavior of Stokes flow in a narrow gap between two surfaces in relative motion. It is assumed that one of the surfaces is rough, with small roughness wavelength l, so that the film thickness h becomes rapidly oscillating. Depending on the limit of the ratio h/l, denoted as k, three different lubrication regimes exist: Reynolds roughness (k-0), Stokes roughness (0<γ<1), and high-frequency roughness (γ = ∞). In each regime, the pressure field is governed by a generalized Reynolds equation, whose coefficients (so-called flow factors) depend on k. To investigate the accuracy and applicability of the limit regimes, we compute the Stokes flow factors for various roughness patterns by varying the parameter k. The results show that there are realistic surface textures for which the Reynolds roughness is not accurate and the Stokes roughness must be used instead.
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2.
  • Tsandzana, Afonso Fernando, 1969- (author)
  • Homogenization of a mathematical model for cavitation in thin film flow
  • 2017
  • In: AIP Conference Proceedings. - : AIP Publishing. - 0094-243X .- 1551-7616. ; 1798
  • Journal article (peer-reviewed)abstract
    • This paper is a contribution to mathematical modeling of thin film flow between two surfaces which are in relative motion. In particular such flows are important in lubrication theory. For many shapes of the surfaces and boundary conditions the pressure in the fluid will be so low that the continuous fluid film ruptures and air bubbles are formed. This phenomenon is known as cavitation and have a huge impact on the hydrodynamic performance. We derive a mathematical model of thin film flow between two close surfaces which takes into account cavitation, surface roughness and pressure dependent density. Moreover, we use two-scale convergence to homogenize the model. In addition, we compute the coefficients of the homogenized equation for a simple class of functions that describe the film thickness.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Tsandzana, Afonso Fe ... (2)
Wall, Peter (1)
Fabricius, John (1)
Pérez-Ràfols, France ... (1)
University
Luleå University of Technology (2)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)
Engineering and Technology (1)
Year
2017 (2)Undo refine

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