Talks and Poster Presentations (with Proceedings-Entry):
I. A. Neacșu, B. Scheichl, A. Kluwick:
"Nonlinear effects due to cavitation in self-lubricated bearings";
Talk: GAMM - 82nd Annual Meeting,
Graz;
2011-04-18
- 2011-04-21; in: "Special Issue: 82nd Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), Graz 2011",
G. Brenn, G. A. Holzapfel, M. Schanz, O. Steinbach (ed.);
PAMM - Proceedings in Applied Mathematics and Mechanics / Wiley-VCH,
11/1 / Weinheim, Germany
(2011),
ISSN: 1617-7061;
Paper ID (pp.) 581-582,
2 pages.
English abstract:
Self-lubricating bearings are journal bearings having a porous network which acts as a reservoir of fluid. Impregnation is done once, and is enough to sustain life-time lubrication. Our concern in this type of application is with the phenomena of film cavitation. In this sense we solve a modified Reynolds equation numerically, including a refinement of the pressure-density relation, and subsequently couple the result in terms of pressure with Darcy`s law for flows through porous media. The resulting iterative method is based on a so-called "simulated-annealing" strategy, which properly accounts for the nonlinearity due to the presence of cavitation and the density change in the cavitation region together with the continuity in the fully liquid regime. The numerical results provide an accurate description of both the pressure and density variations. The most interesting limiting case and that we have studied thoroughly is the one for which the eccentricity ε is quite high (ε -> 1-), corresponding to highly loaded bearings. This case is taken into careful consideration for determining the limits of applicability of classical cavitation theory, i.e. when the film thickness is considerably small, and the effects of the roughness come into play. By means of homogenisation techniques, we expect to provide a more rationally founded expression for the permeability, amongst others leading to a better approximation of the flow through the clearance of the bearing.
Keywords:
cavitation, Darcy's law, lubrication theory, porous journal bearings, Reynolds equation
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1002/pamm.201110280
Electronic version of the publication:
http://publik.tuwien.ac.at/files/PubDat_195207.pdf
Created from the Publication Database of the Vienna University of Technology.