Non-linear stability analysis of micropolar fluid lubricated journal bearings with turbulent effect

Abstract

Purpose The purpose of this paper is to investigate the effect of turbulence on the stability characteristics of finite hydrodynamic journal bearing lubricated with micropolar fluid. Design/methodology/approach The non-dimensional transient Reynolds equation has been solved to obtain the non-dimensional pressure field which in turn used to obtain the load carrying capacity of the bearing. The second-order equations of motion applicable for journal bearing system have been solved using fourth-order Runge–Kutta method to obtain the stability characteristics. Findings It has been observed that turbulence has adverse effect on stability and the whirl ratio at laminar flow condition has the lowest value. Practical implications The paper provides the stability characteristics of the finite journal bearing lubricated with micropolar fluid operating in turbulent regime which is very common in practical applications. Originality/value Non-linear stability analysis of micropolar fluid lubricated journal bearing operating in turbulent regime has not been reported in literatures so far. This paper is an effort to address the problem of non-linear stability of journal bearings under micropolar lubrication with turbulent effect. The results obtained provide useful information for designing the journal bearing system for high speed applications.

Influence of lubricants on the performance of journal bearings – a review

“…Ram et al [74] analysed the effect of turbulent flow on dynamic performance characteristics of journal bearing and found that the stiffness coefficients were decreased in turbulent flow as compared to laminar flow whereas the damping coefficients increased in turbulent flow conditions. It was found that the stability of hydrostatic journal bearing adversely effected due to turbulence [75]. The hole entry journal bearings with constant flow valve and capillary restrictors were analysed and compared with slot entry journal bearings considering micropolar lubrication.…”

Analysis of elliptical dam bearing lubricated with micropolar fluid

“…Eringen (1966) reported that micropolar lubrication can improve the performance of the journal bearing system. Das and Guha (2019) revealed in their work that stability can be achieved at N 2 = 0.7 and l m < 20. Nekoeimehr et al (2013) studied the static performance of different lobed bearings and observed an enhancement in their performance for higher lobed bearing.…”

Analysis of turbulent cavitation effects on water-lubricated bearing in single screw compressors

“…Feng and Peng (2018) studied the influence of turbulent cavitation flow on the static performance of the thrust bearing with groove texture. Das and Guha (2018) investigated the impact of turbulence on the stability performance of the The current issue and full text archive of this journal is available on Emerald Insight at: https://www.emerald.com/insight/0036-8792.htm bearing micropolar and concluded that turbulent flow has a detrimental impact on stability. Zhu et al (2019) proposed a stochastic turbulent lubrication method, and the performance of bearing with the isotropic rough surface was explored.…”

“…Feng and Peng (2018) studied the influence of turbulent cavitation flow on the static performance of the thrust bearing with groove texture. Das and Guha (2018) investigated the impact of turbulence on the stability performance of the bearing micropolar and concluded that turbulent flow has a detrimental impact on stability. Zhu et al.…”