Theoretical analysis of jornal bearings lubricated with non-Newtonian fluid based Carreau viscosity model

• Autorzy: Mongkolwongrojn M. , Aiumpornsin Ch.
• Konferencja: Third International Conference on Engineering Rheology, ICER 2005
• Języki publikacji: EN

Abstrakty

EN

The static and dynamic characteristics of journal bearings lubricated with non-Newtonian fluids based on Carreau viscosity model have been investigated theoretically. The time-dependent modified Reynolds equation and the adiabatic energy equations have been formulated using Carreau viscosity model. The simultaneous system of modified Reynolds and adiabatic energy equations were solved numerically with boundary conditions using finite difference technique. The linearized bearing reactions and the journal motion can be approximated to obtain the spring and damping coefficient. Static characteristics are presented as pressure profile, temperature profile, load carrying capacity and the coefficient of friction with varying the eccentricity ratio. The stiffness coefficients, damping coefficients and the stability of the journal bearing are investigated with varying the parameters of the non-Newtonian fluid model. In this study, the shear rate of non-Newtonian lubricant and the model parameters have significant effects on the characteristics of journal bearings lubricated with the non-Newtonian fluids.

Słowa kluczowe

EN

time dependent Reynolds equation; adiabatic energy equation; Carreau viscosity model; hydrodynamic journal bearings

PL

reologia; równanie Reynoldsa; model Carreau

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2005
• Tom: Vol. 10, no spec
• Strony: 245--253
• Opis fizyczny: Bibliogr. 8 poz., tab., wykr.

Twórcy

autor

Mongkolwongrojn M.

• Electro-Mechanical Engineering Lab, ReCCIT, Faculty of Engineering King Mongkut's Institute of Technology , Ladkrabang Bangkok 10520, THAILAND

autor

Aiumpornsin Ch.

• King Mongkut's Institute of Technology Ladkrabang Bangkok 10520, THAILAND

Bibliografia

• [1] Chhabra R.P. and Richardon J.F.(1999): Non-Newtonian Flow in the Process Industries, Fundamentals and Engineering Applications. - Butterworth Heinemann, pp.8-11.
• [2] Dien I.K. and Elrod H.G. (1983): A generalized steady-state Reynolds equation for non-Newtonian fluidsy with application to journal bearings. - Journal of Lubrication Technology, vol. 105, pp.385-390.
• [3] Hamrock B .J. (1994): Fundamentals of Fluid Film Lubrication. - McGraw-Hill, Inc., pp.236-258.
• [4] Hashimoto H. and Wada S. (1971): Hydrodynamic lubrication of journal bearings by pseudo-plastic lubricants. Part 1. Theoretical studies. - Bull, of JSME., vol. 14, No.69, pp.268-278.
• [5] Jnng J.Y. and Chang C.C. (1988): Adiabatic analysis of finite width journal bearings with non-Newtonian lubricants. - Wear, vol. 122, pp.63-75.
• [6] Lund J.W. (1987): Review of the concept of dynamic coefficients for fluid film journal bearings. - Journal of Tribology, vol.109, pp.37-41.
• [7] Mongkolwongrojn M. and Arummetta P. (2002): Theoretical characteristics of hydrodynamic journal bearings lubricated with soybean-based oils. - J. of Synthetic Lubrication, vol. 19, pp.213-228.
• [8] Mongkolwongrojn M. and Aiumpormsin C. (2003): Static and dynamic characteristics of journal bearings with non-Newtonian palm-based oils. - Special issue, Int. J. of Applied Mechanics and Engineering, vol.8, pp.79-86.