SwePub
Sök i SwePub databas

  Utökad sökning

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

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

  • Resultat 1-2 av 2
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Fabricius, John, et al. (författare)
  • A Comparison of the Roughness Regimes in Hydrodynamic Lubrication
  • 2017
  • Ingår i: Journal of tribology. - : The American Society of Mechanical Engineers (ASME). - 0742-4787 .- 1528-8897. ; 139:5
  • Tidskriftsartikel (refereegranskat)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.
  •  
2.
  • Tsandzana, Afonso Fernando, 1969- (författare)
  • Homogenization of a mathematical model for cavitation in thin film flow
  • 2017
  • Ingår i: AIP Conference Proceedings. - : AIP Publishing. - 0094-243X .- 1551-7616. ; 1798
  • Tidskriftsartikel (refereegranskat)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.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Tsandzana, Afonso Fe ... (2)
Wall, Peter (1)
Fabricius, John (1)
Pérez-Ràfols, France ... (1)
Lärosäte
Luleå tekniska universitet (2)
Språk
Engelska (2)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (2)
Teknik (1)
År
2017 (2)Ta bort avgränsningen

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy