Generalized Newtonian fluids as lubricants in the hydrodynamic conical bearings : a CFD analysis

• Autorzy: Czaban A.

Identyfikatory

DOI

10.5604/12314005.1213564

• Języki publikacji: EN

Abstrakty

EN

Additives, ageing or wear and impurities can cause, that relationship between shear stress and shear rate in a lubricating oil is or becomes non-linear, and due to this, a significant change in the values of operating parameters of slide hydrodynamic bearings may occur. It is important to take into account such dependence during design and simulations of slide bearings. The calculations, which consider the non-linear properties of the lubricating oil, can be carried out by adopting the generalized Newtonian fluid models. This paper shows the result of CFD simulation of slide conical bearings hydrodynamic lubrication, assuming that the lubricating oil behaves as a generalized Newtonian fluid. The hydrodynamic pressure distributions, load carrying capacities and friction torques were calculated for bearings lubricated with different types of generalized Newtonian fluids and the obtained data were compared. In the study, the following models of fluids were adopted: the Power-law fluid (Ostwald-de Waele), the Cross fluid and the Carreau fluid. The coefficients of mentioned relationships were determined by fitting the curves described by each model to the experimental data using the least squares approximation method. The calculations of hydrodynamic pressure distributions, load carrying capacities and friction torques were carried out using the commercial CFD software Ansys Fluent from the Ansys Workbench 2 platform.

Słowa kluczowe

EN

hydrodynamic conical bearing; generalized Newtonian fluid; CFD; non-Newtonian oil; pressure distribution; dynamic viscosity; ferro-oil

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2016
• Tom: Vol. 23, No. 2
• Strony: 89--95
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Czaban A.

• Gdynia Maritime University, Faculty of Marine Engineering Morska Street 81-87, 81-225 Gdynia, Poland tel.:[phone], fax: [phone]

Bibliografia

• [1] Czaban, A., Frycz, M., Horak, W., Effect of the Magnetic Particles Concentration on the Ferro-oil’s Dynamic Viscosity in Presence of an External Magnetic Field in the Aspect of Temperature Changes, Journal of KONES, Vol. 20, No. 2, pp. 55-60, Warsaw 2013.
• [2] Frycz, M., Effect of Concentration of Magnetcic Particles on Ferroiil’s Dynamic Viscosity as a Function of Temperature and Shear Rate, Journal of KONES, Vol. 19, No. 2., pp. 159-165, Warsaw 2012.
• [3] Frycz, M., Czaban, A., Influence of Pressure on Ferro-Oil Dynamic Viscosity, Zeszyty Naukowe Akademii Morskiej w Gdyni, Nr 83, pp. 45-52, 2014.
• [4] Gan, Y., X., et all., Continuum Mechanics – Progress in Fundamentals and Engineering Applications, Chapter 3: Incompressible Non-Newtonian Fluid Flows, by Nguyen, Q., Nguyen, N., InTech, 2012.
• [5] Lee, W., Ilavsky, J., Particle size distribution in ferrofluid macro-clusters, Journal of Magnetism and Magnetic Materials, 330, pp. 31-36, 2013.
• [6] Miszczak, A., Analiza hydrodynamicznego smarowania ferrociecza poprzecznych łożysk ślizgowych, Fundacja Rozwoju Akademii Morskiej, Gdynia 2006.
• [7] Mitsoulis, E., Flows of Viscoplastic Materials: Models and Computations, Rheology Reviews, pp. 135-178, 2007.
• [8] Nguyen, V. H., Rémond, S., Gallias, J. L., Bigas, J.,P., Muller, P., Flow of Herschel–Bulkley fluids through the Marsh cone, J. Non-Newtonian Fluid Mech., 139, pp. 128-134, 2006.
• [9] Nowak, Z., Wierzcholski, K., Flow of a Non-Newtonian Power Law Lubricant trough the Conical Bearing gap, Acta Mechanica 50, pp. 221-230, 1984.
• [10] Rao, A., Rheology of Fluid, Semisolid, and Solid Foods. Principles and Applications, Springer, New York 2014.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.