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Effects of Nanoparticle Enhanced Lubricant Films in Dynamic Properties of Plain Journal Bearings at High Reynolds Numbers

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The aim of this paper is numerical analysis of plain journal bearing with nanoparticle added lubricating oil. The fluid film bearing is studied with the modified Reynolds equation which considered time dependent inertia effects at rotating speeds with the linearized turbulence. The research is performed for numerous nanofluids include nanoparticles of CuO, TiO2, Ag and Cu and SAE 20W50 as a base fluid. The time transient governing equations include the incompressible mass conservation equation, Navier-Stokes momentum equations for thin film lubrication, and full kinematic including shaft accelerations are solved numerically. Two cases of long and short bearings are studied with Sommerfeld and Gumbel boundary conditions. Linearized force coefficients such as mass, stiffness and damping factors are obtained for an ordinary journal bearing. The ordinary plain journal bearing velocity response and the rotor displacements when sudden forces applied by rigid rotor symmetrically is achieved. The results prove that using the nanoparticle enhanced lubricant causes higher mass coefficients, damping ratios and fluid effective stiffness.


International Journal of Engineering and Technologies (Volume 13)
M. Y. A. Jamalabadi, "Effects of Nanoparticle Enhanced Lubricant Films in Dynamic Properties of Plain Journal Bearings at High Reynolds Numbers", International Journal of Engineering and Technologies, Vol. 13, pp. 1-23, 2017
Online since:
December 2017

[1] J. Tichy, B. Bou-Said, Hydrodynamic lubrication and bearing behavior with impulsive loads, Tribology Transactions. 34(4) (1991) 505–512.

[2] H. Hong et al., Nanogreases based on carbon nanotubes and commercial thickeners, NLGI Spokesman. 73(6) (2009) 23–32.

[3] H. Hong, A.J. Waynick, W. Roy, Nanogrease based on carbon nanotube, NLGI Spokesman. 72(7) (2008) 9.

[4] J. Chen, Tribological properties of polytetrafluoroethylene, nano-titanium dioxide, and nano-silicon dioxide as additives in mixed oil-based titanium complex grease, Tribology Letters. 38 (2010) 217–224.

[5] N. Canter, Friction-reducing characteristics of nano-boric acid, Tribology & Lubrication Technology. 64(2) (2008) 10–11.

[6] A. Tomala et al., Effect of base oil polarity on micro and nanofriction behaviour of base oil + zddp solutions, Tribology – Materials, Surfaces & Interfaces. 3(4) (2009) 182–188.

[7] H. Hong et al., Nanogreases based on carbon nanotubes and commercial thickeners, NLGI Spokesman. 73(6) (2009) 23–32.

[8] Nanotechnology: Untold promise, untold risk. Consumer Reports, 2007, p.40–45.

[9] G.L.X. Liu et al., Investigation of the mending effect and mechanism of copper nano-particles on a tribologically stressed surface, Tribology Letters. 17(4) (2004) 961–966.

[10] Y. Choi et al., Tribological behavior of copper nanoparticles as additives in oil, Current Applied Physics. 9 (2009) 124–127.

[11] C.G. Lee et al., A study on the tribological characteristics of graphite nano lubricants, International Journal of Precision Engineering and Manufacturing. 10(1) (2009) 85–90.

[12] G.R. Vakili-Nezhaad, A. Dorany, Investigation of the effect of multiwalled carbon nanotubes on the viscosity index of lube oil cuts, Chemical Engineering Communications. 196 (2009) 997–1007.

[13] J. Lee et al., Enhancement of lubrication properties of nano-oil by controlling the amount of fullerene nanoparticle additives, Tribology Letters. 28(2) (2007) 203–208.

[14] B.C. Ku et al., Tribological effects of fullerene (C60) nanoparticles added in mineral lubricants according to its viscosity, International journal of Precision Engineering and Manufacturing. 11(4) (2010) 607-611.

[15] S.J. Lee et al., Application of fullerene-added nano-oil for lubrication enhancement in friction surfaces, Tribology International. 42 (2009) 440–447.

[16] X. Li, D. Zhu, X. Wang, Experimental investigation on viscosity of Cu-H2O nanofluids, Journal of Wuhan University of Technology-Mater. 24(1) (2009) 48–52.

[17] W. Li et al., Friction and wear properties of ZrO2/SiO2 composite nanoparticles, Journal of Nanoparticles Research. 13 (2011) 2129–2137.

[18] Y. Wu, W. Tsuia, T. Liub, Experimental analysis of tribological properties of lubricating oils with nanoparticle additives, Wear. 262(7-8) (2007) 819–825.

[19] K. Lee et al., Understanding the role of nanoparticles in nano-oil lubrication, Tribology Letters. 35 (2009) 127–131.

[20] A.Z. Szeri, Fluid film lubrication theory and design, Cambridge University Press, Cambridge, (1998).

[21] O. Pinkus, B. Sternlicht, Theory of hydrodynamic lubrication, McGraw-Hill, New York, (1961).

[22] M.B. Banerjee et al., A nonlinear theory of hydrodynamic lubrication, Journal of Mathematical Analysis and Applications. 117(1) (1986) 48–56.

[23] C. -H. Chen, C. -K. Chen, The influence of fluid inertia on the operating characteristics of finite journal bearings, Wear. 131 (1989) 229–240.

[24] A.K. Tieu, Turbulence and inertia effects in finite width stepped thrust beaings, in: Proceedings of 13th Leeds-Lyon Symposium on Tribology, Fluid Film Lubrication – Osborne Reynolds Centenary, Eds. Dowson, Taylor, Godet, and Berthe, 1986, pp.411-416.

[25] C.W. Ng, Fluid dynamic foundation of turbulent flow, ASLE Transactions. 7(4) (1964) 311-321.

[26] C.W. Ng, C.H.T. Pan, A linearized turbulent lubrication theory, Journal of Basic Engineering. 87(3) (1965) 675–682.

[27] H.G. Elrod, C.W. Ng, A theory for turbulent fluid films and its application to bearings, Journal of Lubrication Technology. 89(3) (1967) 346–362.

[28] V.N. Constaninescu, On the influence of inertial forces in turbulent and laminar self-acting films, Journal of Lubrication Technology. 93(2) (1970) 473–480.

[29] V.N. Constantinescu, S. Galetuse, On the possibilities of improving the accuracy of the evaluation of inertia forces in laminar and turbulent films, Journal of Lubrication Technology. 96(1) (1974) 69–77.

[30] V.N. Constantinescu, S. Galetuse, Operating characteristics of journal bearings in turbulent inertial flow, Journal of Lubrication Technology. 104(1) (1982) 173–179.

[31] A.Z. Szeri, A.A. Raimondi, A. Giron-Duarte, Linear force coefficients for squeeze-film dampers, Journal of Lubrication Technology. 105 (1983) 326–334.

[32] L. San Andrés, J. Vance, Effect of fluid inertia on finite length sealed squeeze film dampers, ASLE Transactions. 30(3) (1987) 384–393.

[33] E. Reinhardt, J.W. Lund, The influence of fluid inertia on the dynamic properties of journal bearings, Journal of Lubrication Technology. 97 (1975) 159–167.

[34] S.K. Kakoty, B.C. Majumdar, Effect of fluid inertia on stability of oil journal bearings, Journal of Tribology. 122(4) (2000) 741–745.

[35] P.E. Allaire, R.D. Flack, Journal bearing design for high speed turbomachinery, Bearing Design - Historical Aspects, Present Technology, and Future Problems, 1980, p.111–160.

[36] R.D. Flack, P.E. Allaire, Instability Thresholds for Flexible Rotors in Hydrodynamic Bearings, in: Rotor Dynamic Instability Problems in High Performance Machines, Texas A&M University, May 12-14, NASA Conference Publication 2133, 1980, p.403.

[37] B.C. Majumdar, D.E. Brewe, Stability of a rigid rotor supported on oil-film journal bearings under dynamic load, NASA Technical Memorandum 102309, AVS-COM, Technical Report 87-C-26, 1987, p.1–10.

[38] S. Dousti et al., Temporal and convective inertia effects in plain journal bearings with eccentricity, velocity and acceleration, Journal of Tribology. 134(3) (2012) 031704.

[39] S. Dousti et al., An extended reynold equation applicable to high reduced reynolds number operation of journal bearings, Tribology International. 102 (2016) 182–197.

[40] F. He et al., Squeeze film damper effect on vibration of an unbalanced flexible rotor using harmonic balance method, Journal of Engineering Science and Technology. 12(3) (2017) 667–685.

[41] A. Kornaev et al., Influence of the ultrafine oil additives on friction and vibration in journal bearings, Tribology International. 101 (2016) 131–140.

[42] K.G. Binu et al., A variable viscosity approach for the evaluation of load carrying capacity of oil lubricated journal bearing with TiO2 nanoparticles as lubricant additives, Procedia Materials Science. 6 (2014) 1051–1067.

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