Effect of couple stress parameter on steady-state and dynamic characteristics of three-lobe journal bearing operating on TiO₂ nanolubricant

Abstract

Steady-state and dynamic performance parameters of three-lobe fluid film bearing, operating on TiO2 nanolubricant have been obtained. The effective viscosity for a given volume fraction of TiO2 nanoparticle in base fluid is obtained by using Krieger–Dougherty viscosity model. Various bearing performance parameters are obtained by solving remodeled Reynolds equation, which includes couple stress parameter. The stiffness and damping coefficients are also obtained for different values of the couple stress parameter. Results show a significant rise in the nondimensional load-carrying capacity and flow coefficient while there is a decrease in friction variable. It also reveals a significant improvement in the dynamic coefficient of bearing.

Investigating the steady state characteristics of noncircular journal bearings lubricated with ferrofluid under concentric finite wire magnetic field

“…They studied the effects of couple stress parameter on the static and dynamic characteristics of three-lobe journal bearings. 36 In this paper by considering Tio2 nanoparticles in Newtonian lubricant as an additive according to Refs. 37,38 the results show that increasing the couple stress parameter shows a very significant improvement in dynamic coefficients and increasing the load carrying capacity, while decreasing the attitude angle and the friction variable.…”

Thermohydrodynamic lubrication analysis of misaligned journal bearing considering surface roughness and couple stress

“…Researchers have found that adding a small amount of long-chain polymer to the lubricant can effectively improve the load capacity performance of the friction pair. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] A small amount of long-chain polymer changes the fluid characteristics of the lubricant, changing the lubricant fluid characteristics from Newtonian fluid to couple stress fluid. From the perspective of engineering applications, such measures are simple and effective.…”

“…The current couple stress fluid lubrication theory is relatively mature, and the mathematical model of couple stress fluid lubrication is derived based on Stokes' microcontinuum theory. Many scholars have applied the mathematical model of coupled stress fluid lubrication to study the static and dynamic performance of various types of friction pairs such as journal bearing, [1][2][3][4][5][6][7] porous journal bearing, 8 double-layered journal bearing, 9 two-lobe journal bearing, [10][11][12] three-lobe journal bearing, 13 gas foil bearing, 14 and sliding bearing. 15 Compared with Newtonian fluid, coupled stress fluid can effectively improve the load capacity of the friction pair.…”

Non-Newtonian couple stress lubrication of MHD elastic journal bearings

“…It increases the film thickness, which results in less wear of direct metal-to-metal contact and improves bearing life (Chippa and Sarangi, 2013). Numerous researchers examined couple stresses influence on bearings systems characteristics, such as journal bearings (Lin, 1997; Kumar and Kakoty, 2020) and porous journal bearings (Bhattacharjee et al , 2019a; Bhattacharjee et al , 2019b; Patil et al , 2020). Wang et al (2002) investigated numerically a journal bearing performance under dynamical loading using couple stress fluids.…”