Analysis of the influence of the changes in the value of dynamic viscosity coefficient in the direction of oil film thickness on the journal bearing load carrying capacity

• Autorzy: Miszczak A.

Identyfikatory

DOI

10.5604/01.3001.0012.4352

• Języki publikacji: EN

Abstrakty

EN

This article presents the results of numerical calculations of the hydrodynamic pressure distribution, load carrying capacity, friction force and friction coefficient of the slide journal bearing, if the assumed model of hydrodynamic lubrication takes into account the dependence of oil viscosity values on its temperature in all three directions of the adopted coordinate system, in particular, also across the thickness of the lubricant layer. This research considered the slide journal bearing lubricated with the Newtonian oil. The flow of oil was modelled as laminar and stationary. The bearing bushing had a full angle of wrap and its surfaces were smooth. In order to obtain hydrodynamic pressure distributions, the Reynolds type equation was numerically solved by application of the finite difference method (FDM). The numerical procedures for this research were prepared with the Mathcad 15 software. When adopting the classic models and simplifications for the hydrodynamic lubrication and a thin boundary layer, it is assumed, that the hydrodynamic pressure of lubricating oil does not depend on the position measured across the height of the lubrication gap. On the other hand, it is known, that the dynamic viscosity strongly depends on the temperature, which is a function of all three spatial variables. The aim of this work is to include, in the hydrodynamic lubrication model, the changes of viscosity in the direction of oil film thickness, and to investigate how it will affect the hydrodynamic pressure distribution and load carrying capacity of the journal bearing.

Słowa kluczowe

EN

slide journal bearing; load carrying capacity; friction force; friction coefficient; numerical calculation

• 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: 2018
• Tom: Vol. 25, No. 3
• Strony: 355--362
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Miszczak A.

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

Bibliografia

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• [3] Czaban, A., The Influence of temperature and shear rate on the viscosity of selected motor oils, Solid State Phenomena, Vol. 199, pp. 188-193, 2013.
• [4] Dunn, J. E., Rajagopal, K. R., Fluids of differential type: critical review and thermodynamic analysis, International Journal of Engineering Science, Vol. 33 (5), pp. 689-729, 1995.
• [5] Galindo-Rosales, F. J., Rubio-Hernández, F. J., Sevilla, A., An apparent viscosity function for shear thickening fluids, Journal of Non-Newtonian Fluid Mechanics, Vol. 166, pp. 321-325, 2011.
• [6] Jang, J. Y., Khonsari, M. M., Thermodynamics design charts for slide hydrodynamic journal bearing, Trans. of ASME, Journal of Tribology, Vol. 119, pp. 859-868, 1997.
• [7] Khan, M., Nadeem, S., Hayat, T., Siddiqui, A. M., Unsteady Motions of a Generalized Second-Grade Fluid, Mathematical and Computer Modelling, Vol. 41, pp. 629-637, 2005.
• [8] Lang, O. R., Steinhilper, W., Gleitlager, Springer Verlag, Berlin-Heidelberg-New York 1978.
• [9] Miszczak, A., Analiza hydrodynamicznego smarowania ferrocieczą poprzecznych łożysk ślizgowych, Monografia, Fundacja Rozwoju Akademii Morskiej, Gdynia 2006.
• [10] Wierzcholski, K., Mathematical methods of hydrodynamic theory of lubrication, Politechnika Szczecińska, Monografia, Nr 511, Szczecin 1993.
• [11] Wierzcholski, K., Teoria niekonwencjonalnego smarowania łożysk ślizgowych, Prace Naukowe Politechniki Szczecińskiej, No. 527, Szczecin 1995.
• [12] Wierzcholski, K., Miszczak, A., A new problem of hydrodynamic lubrication with temperature and viscosity variations in gap height direction, Journal of KONES Powertrain and Transport, Vol. 23, No. 2, pp. 423-430, 2016.
• [13] Wierzcholski, K., Miszczak, A., A study on the adhesion at a micro- and nano-lubrication, Journal of KONES Powertrain and Transport, Vol. 16, No. 4, pp. 499-506, 2009.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).