In this study, performance parameters of a rigid and flexible journal bearing using non-Newtonian nanolubricants have been investigated and compared. Krieger-Dougherty viscosity model has been implemented with a non-Newtonian model (power law) to evaluate the effective viscosity of nanolubricants. In order to attain the pressure field of nanolubricants, a numerical solution of the modified Reynolds equation has been derived with initial assumptions and boundary conditions using finite difference method. The static performance parameters for both the bearings have been examined at different values of power law index and eccentricity ratio. The results demonstrate that the load-carrying capacity, maximum pressure and friction force increase significantly using nanolubricant in comparison to base lubricant. Also, the values of these parameters increase with increase of power law index. An insignificant effect of elastic deformation is observed on performance parameters except attitude angle at a particular power law index value.
WangXIZhuKQWenSZ. Thermohydrodynamic analysis of journal bearings lubricated with couple stress fluids. Tribol Int2001; 34: 335–343.
2.
WangXIZhuKQWenSZ. On the performance of dynamically loaded journal bearings lubricated with couple stress fluids. Tribol Int2002; 35: 185–191.
3.
NairKPAhmedMSAl-qahtaniST. Static and dynamic analysis of hydrodynamic journal bearing operating under nano lubricants. Int J Nanoparticles2009; 2: 251–262.
4.
ShenoyBSBinuKGPaiR, et al.Effect of nanoparticles additives on the performance of an externally adjustable fluid film bearing. Tribol Int2012; 45: 38–42.
5.
WadaSHayashiH. Hydrodynamic lubrication of journal bearings by pseudoplastic lubricants: part 1, theoretical studies. Bull JSME1971; 14: 268–278.
6.
SwamySPrabhuBRaoB. Calculated load capacity of non-Newtonian lubricants in finite width journal bearings. Wear1975; 31: 277–285.
7.
JohnsonKHigginsonJ. A non-Newtonian effect of sliding in micro-EHL. Wear1988; 128: 249–264.
8.
JangJYKhonsariMM. On the thermohydrodynamic analysis of a Bingham fluid in slider bearings. Acta Mech2001; 148: 165–185.
9.
MaYYWangWHChengXH. A study of dynamically loaded journal bearings lubricated with non-Newtonian couple stress fluids. Tribol Lett2004; 17: 69–74.
10.
KumarPKhonsariM. On the role of lubricant rheology and piezo-viscous properties in line and point contact EHL. Tribol Int2009; 42: 1522–1530.
11.
GargHCKumarVShardaHB. A comparative thermal analysis of slot-entry and hole-entry hybrid journal bearings lubricated with non-Newtonian lubricant. J Tribol2010; 132: 1–11.
12.
WilliamsPSymmonsG. Analysis of hydrodynamic slider thrust bearings lubricated with non-Newtonian fluids. Wear1987; 117: 91–102.
13.
BhattacharjeeRDas N. Power law fluid model incorporated into elastohydrodynamic lubrication theory of line contact. Tribol Int1996; 29: 405–413.
SinghCSinhaP. Non-newtonian squeeze films in journal bearings. Wear1981; 70: 311–319.
16.
TannerRI. Short bearing solution for pressure distribution in a Non-Newtonian lubricant. Trans ASME J Appl Mech1964; 31: 350–351.
17.
DienIKElrodHG. A generalized steady-state Reynolds equation for non-Newtonian fluids, with applications to journal bearings. J Lubr Technol1983; 105: 385–390.
18.
JangJChangC. Adiabatic analysis of finite width journal bearings with non-Newtonian lubricants. Wear1988; 122: 63.
19.
LinJFWangLY. Thermohydrodynamic analysis of finite-width, partial-arc journal bearings with non-Newtonian lubricants: part II. Tribol Int1990; 23: 211–216.
20.
JuSWengCL. The Thermohydrodynamic analysis of finite-width journal bearings with non-Newtonian lubricants. Wear1994; 171: 41–49.
21.
NessilALarbiSBelhanecheH, et al.Journal bearings lubrication aspect analysis using non-Newtonian fluids. Adv Tribol2013; 2013: 9.
22.
JainDSharmaSC. Two-lobe geometrically imperfect hybrid journal bearing operating with power law lubricant. Proc IMechE, Part J: J Engineering Tribology2015; 229: 30–46.
23.
DasBJRoyL. Analysis and comparison of steady-state performance characteristics of two-axial groove and multilobe hydrodynamic bearings lubricated with non-Newtonian fluids. Proc IMechE, Part J: J Engineering Tribology2018; 232: 1581–1596.
24.
HigginsonGR. Paper 1: the theoretical effects of elastic deformation of the bearing liner on journal bearing performance. Proc IMechE Conf Proc2010; 180: 31–38.
25.
MokhiamerUMCrosbyWAEl-GamalHA. A study of a journal bearing lubricated by fluids with couple stress considering the elasticity of the liner. Wear1999; 224: 194–201.
26.
OsmanTA. Effect of lubricant non-Newtonian behavior and elastic deformation on the dynamic performance of finite journal plastic bearings. Tribol Lett2004; 17: 31–40.
27.
BouyerJFillonM. On the significance of thermal and deformation effects on a plain journal bearing subjected to severe operating conditions. J Tribol2004; 126: 819.
28.
Attia HiliMBouazizSMaatarM, et al.Hydrodynamic and elastohydrodynamic studies of a cylindrical journal bearing. J Hydrodyn2010; 22: 155–163.
29.
ChettiB. Analysis of a circular journal bearing lubricated with micropolar fluids including EHD effects. Ind Lubr Tribol2014; 66: 168–173.
30.
ChettiBZouggarH. Steady-state performance of a circular journal bearing lubricated with a non-Newtonian fluid considering the elastic deformation of the liner. Proc IMechE, Part J: J Engineering Tribology2019; 233: 1389–1396.
31.
DowsonD. A generalized Reynolds equation for fluid film lubrication. Int J Mech Eng Sci1962; 4: 159–170.
32.
GargHCKumarVShardaHB. Performance of slot-entry hybrid journal bearings considering combined influences of thermal effects and non-Newtonian behavior of lubricant. Tribol Int2010; 43: 1518–1531.
33.
KriegerIMDoughertyTJ. A mechanism for non-Newtonian flow in suspensions of rigid spheres. Trans Soc Rheol1959; 3: 137–152.
34.
MahbubulIMSaidurRAmalinaMA. Latest developments on the viscosity of nanofluids. Int J Heat Mass Transf2012; 55: 874–885.
35.
KoleMDeyTK. Effect of aggregation on the viscosity of copper oxide e gear oil nano fluids. Int J Therm Sci2011; 50: 1741–1747.
36.
HookeCJBrightonDKO'DonoghueJP. The effect of elastic distortions on the performance of thin shell bearings. Proc IMechE Conf Proc1966; 181: 63–69.
37.
Jain SC and Sinhasan R. Performance of flexible shell journal bearings with variable viscosity lubricants. Tribol Int 1983; 16: 331–339.
38.
BinuKGShenoyBSRaoDS, et al.Static characteristics of a fluid film bearing with TiO2 based nanolubricant using the modified Krieger-Dougherty viscosity model and couple stress model. Tribol Int2014; 75: 69–79.
