Pressure and velocity distribution in slide journal bearing lubricated micropolar oil

• Autorzy: Krasowski P.
• Języki publikacji: EN

Abstrakty

EN

Present paper shows the results of numerical solution Reynolds equation for laminar, steady oil flow in slide bearing gap. Lubrication oil is fluid with micropolar structure. Materials engineering and tribology development helps to introduce oils with the compound structure (together with micropolar structure) as a lubricating factors. Properties of oil lubrication as of liquid with micropolar structure in comparison with Newtonian liquid, characterized are in respect of dynamic viscosity additionally dynamic couple viscosity and three dynamic rotation viscosity. Under regard of build structural element of liquid characterized is additionally microinertia coefficient. In modelling properties and structures of micropolar liquid one introduced dimensionless parameter with in terminal chance conversion micropolar liquid to Newtonian liquid. The results shown on diagrams of hydrodynamic pressure, velocity and velocity of microrotation distribution in dimensionless form in dependence on coupling number N2 and characteristic dimensionless length of micropolar fluid A1. Differences were showed on graphs in the schedule of the circumferential velocity oils after the height of the gap in the flow of the micropolar and Newtonian liquid. In presented flow, the influence of lubricating fluid inertia force and the external elementary body force field were omitted. Presented calculations are limited to isothermal models of bearing with infinite length.

Słowa kluczowe

EN

micropolar lubrication; journal bearing; hydrodynamic pressure; velocity; velocity of microrotation

• 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: 2011
• Tom: Vol. 18, No. 4
• Strony: 213--220
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Krasowski P.

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

Bibliografia

• [1] Das, S., Guha, S. K., Chattopadhyay, A. K., Linear stability analysis of hydrodynamic journal bearings under micropolar lubrication, Tribology International 38, pp. 500-507, 2005.
• [2] Krasowski, P., Stacjonarny, laminarny przepływ mikropolarnego czynnika smarującego w szczelinie smarnej poprzecznego łożyska śizgowego, Zeszyty Naukowe, Akademia Morska, Nr 49, pp. 72-90, Gdynia 2003.
• [3] Krasowski, P., Pressure and velocity distribution in slide journal bearing lubricated micropolar oil, Journal of Polish CIMAC, Energetic Aspects, Vol. 5 No. 1, pp. 119–126, Gdansk 2010.
• [4] Łukaszewicz, G., Micropolar Fluids. Theory and Aplications, Birkhäuser, Boston 1999.
• [5] Walicka, A., Reodynamika pzepływu płynów nienewtonowskich w kanałach prostych i zakrzywionych, Uniwersytet Zielonogórski, Zielona Góra 2002.
• [6] Walicka, A., Inertia effects in the flow of a micropolar fluid in a slot between rotating sufrages of revolution, International Journal of Mechanics and Engineering, Vol. 6, No. 3, pp. 731-790, 2001.
• [7] Wang, X. L., Zhu, K. Q., Numerical analysis of journal bearings lubricated with micropolar fluids including thermal and cavitating effects, Tribology International 39, pp. 227-237, 2006.