CFD analysis of non-Newtonian and non-isothermal lubrication of hydrodynamic conical bearing

• Autorzy: Czaban A.

Identyfikatory

DOI

10.5604/12314005.1130429

• Języki publikacji: EN

Abstrakty

EN

In this work is shown the result of CFD simulation of hydrodynamic conical bearing lubrication with consideration of non-isothermal oil flow in a bearing lubrication gap and also with assumption, that oil has non- Newtonian properties. The determination of hydrodynamic pressure distribution in bearing gap was carried out by using the commercial CFD software ANSYS Academic Research for fluid flow phenomenon (Fluent). Calculations were performed for bearings without misalignment, i.e. where the cone generating line of bearing shaft is parallel to the cone generating line of bearing sleeve. The Ostwald-de Waele model for non-Newtonian fluids was adopted in this simulation. The coefficients of Ostwald-de Waele relationship were determined by application of the least squares approximation method and fitting curves described by this model to the experimental data, obtained for some motor oils, presented in previous work. The calculated hydrodynamic pressure distributions were compared with the data obtained for corresponding bearings, but assuming that the flow in the bearing lubrication gap is isothermal. Some other simplifying assumptions are: a steady-state operating conditions of a bearing, incompressible flow of lubricating oil, no slip on bearing surfaces, pressure on the side surfaces of bearing gap is equal to atmospheric pressure. This paper presents results for bearings with different rotational speeds and of different bearing gap heights.

Słowa kluczowe

EN

conical bearing; hydrodynamic lubrication; CFD simulation; non-Newtonian oil; non-isothermal flow; pressure distribution

• 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: 2014
• Tom: Vol. 21, No. 4
• Strony: 49--56
• Opis fizyczny: Bibbliogr. 6 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., The Influence of the Viscosity of Selected Motor Oils, Temperature and Shear Rate on, Solid State Phenomena, Vol. 199, pp. 188-193, 2013.
• [2] 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, 2013.
• [3] Miszczak, A., Analiza hydrodynamicznego smarowania ferrociecza poprzecznych łożysk ślizgowych, Fundacja Rozwoju Akademii Morskiej, Gdynia 2006.
• [4] Nowak, Z., Wierzcholski, K., Flow of a Non-Newtonian Power Law Lubricant trough the Conical Bearing gap, Acta Mechanica, 50, pp. 221-230, 1984.
• [5] Ramírez-González, P. V., et al., Non-Newtonian Viscosity Modeling of Crude Oils –Comparison Among Models, Int. J Thermophys, 30:1089-1105, 2009.
• [6] Szeri, A., Z., Fluid film lubrication. Theory & Design, Cambridge University Press,Cambridge, 1998.