Preload effects on the static performance of multi-lobe fixed profile journal bearings with micropolar fluids

Rahmatabadi, A D; Meybodi, R Rashidi; Nekoeimehr, M

doi:10.1177/1350650111403580

Cited by 20 publications

(31 citation statements)

References 37 publications

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“…However, journal bearings with different geometrical configurations and operating conditions are the most studied sliding bearings. We can quote the following research examples for: infinitely long, 13,14 short 15,16 and finite length/width 17–19 plain bearings, partial bearings, 20 porous bearings, 21,22 hydrostatic, 23 hybrid 24 and non-circular: elliptical, 25 two-lobe 26 and multi-lobe 27,28 journal bearings, etc. The results showed favorable performance characteristics of the above bearings with micropolar lubricant as compared to Newtonian fluid, where the maximum load capacity and friction force were observed to increase with the increase in concentration of additives and contaminants in the lubricant.…”

Section: Introductionmentioning

confidence: 99%

Computational investigation on the performance of hydrodynamic micro-textured journal bearing lubricated with micropolar fluid using mass-conserving numerical approach

Manser

Belaidi

Khelladi

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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The tribological characteristic of journal bearing systems can be enhanced with the integrating of textures in the contact interfaces, or using the lubricating effect of non-Newtonian fluids. In this study, the combined effects of bearing surface texturing and non-Newtonian lubricants behavior, using micropolar fluid model, on static characteristics of hydrodynamic circular journal bearings of finite length are highlighted. The modified Reynolds equation of micropolar lubrication theory is solved using finite differences scheme and Elrod's mass conservation algorithm, taking into account the presence of the cylindrical texture shape on full and optimum bearing surfaces. The optimization textured area is carried out through particle swarm optimization algorithm, in order to increase the load lifting capacity. Preliminary results are in good agreement with the reference ones, and present an enhancement in the performances of micro-textured journal bearings (load carrying capacity and friction). The results suggest that texturing the bearing convergent zone significantly increases the load carrying capacity and reduce friction coefficient, while fully texturing causes bad performances. It is also shown that the micropolar fluids exhibit better performances for smooth journal bearings than a Newtonian fluid depending on the size of material characteristic length and the coupling number. The combined effects of fully surface textured with micropolar fluids reduce the performance of journal bearing, especially at lower eccentricity ratios. Considering the optimal arrangement of textures on the contact surface, a significant improvement in terms of load capacity and friction can be achieved, particularly at high eccentricity ratios, high material characteristic lengths and high values of the coupling numbers of micropolar fluids.

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Section: Introductionmentioning

confidence: 99%

Computational investigation on the performance of hydrodynamic micro-textured journal bearing lubricated with micropolar fluid using mass-conserving numerical approach

Manser

Belaidi

Khelladi

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…In the present study, operating variables have been chosen from available literature [42,[44][45][46] and presented in Table 2. A steady-state pressure distribution is obtained by coupled solution of Reynolds Eq.…”

Section: Resultsmentioning

confidence: 99%

“…The physical interpretation of these parameters is that a higher value of N 2 ð Þ implies high microrotation and a smaller value of ðl m Þ implies big suspended particle size in the micropolar lubricant. The values of micropolar parameters N 2 ð Þ and ðl m Þ have been chosen from the published literature [44][45][46]. Figures 3 and 4 illustrate that the fluid film thickness H ð Þ increases with increase in the characteristics length ð l m Þ and coupling number N 2 ð Þ of micropolar lubricant.…”

Section: Effect Of Micropolar Lubricant Parameters On Variation Of Flmentioning

confidence: 99%

Numerical modeling of elastohydrodynamic lubrication of line contact lubricated with micropolar fluid

Jadhav

Thakre

Sharma

2018

J Braz. Soc. Mech. Sci. Eng.

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This paper presents numerical investigation on elastohydrodynamic lubrication (EHL) of line contacts lubricated with micropolar fluids. Numerical model of EHL line contact has been developed by coupled solution of Reynolds equation, elastic deformation equation, load balance equation and fluid rheology equation from inlet to the outlet region. This system of equations has been solved using finite element method techniques. The influence of micropolar fluid parameters and operating parameter on the performances EHL line contacts has been investigated. Further, a comparative assessment on the micropolar and Newtonian fluid-lubricated contact has been presented. It has been observed that the use of micropolar fluid parameters enhances the values of minimum and central fluid film thickness and contact pressure within the EHL line contacts. The empirical formulae for minimum H min ð Þ and central H cent ð Þfluid film thickness are formulated based on the numerically simulated results. The study reveals that overall performances of EHL line contacts increases significantly with micropolar fluid parameter. Further, it has been observed due to micropolar lubricant in EHL line contacts, chances of metal-to-metal contact reduces.

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“…In the above equations, when δ = 0 and when φ1=φ2=φ3=φ, then ε1=ε2=ε3=ε and hence the equation (7) is applicable for circular journal bearing condition. 23…”

Section: Mathematical Modelmentioning

confidence: 99%

Static and dynamic performance characteristics of powder lubricated symmetrical three-lobed bearing

Jose

Behera

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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Hydrodynamic oil bearings applied at elevated temperatures and extreme operating conditions are subjected to the problem of oil degradation. In order to overcome such conditions, dry powder lubricants are used as lubricants in the hydrodynamic journal bearings. Thus the problem of thermal degradation of oil at high temperatures can be eliminated. In this work, the static and dynamic characteristics of a symmetric three-lobed bearing lubricated with powdered particles have been predicted. Influence of the ellipticity ratio on the performance of the three-lobed bearing has also been investigated. It is observed that an increase in the ellipticity ratio increases the coefficient of friction and stability, but decreases the side leakage and the load carrying capacity of the three-lobed bearing. Also, it was observed that the large-sized powdered particles induce better load carrying capacity and better stability than the small-sized particles.

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Preload effects on the static performance of multi-lobe fixed profile journal bearings with micropolar fluids

Cited by 20 publications

References 37 publications

Computational investigation on the performance of hydrodynamic micro-textured journal bearing lubricated with micropolar fluid using mass-conserving numerical approach

Computational investigation on the performance of hydrodynamic micro-textured journal bearing lubricated with micropolar fluid using mass-conserving numerical approach

Numerical modeling of elastohydrodynamic lubrication of line contact lubricated with micropolar fluid

Static and dynamic performance characteristics of powder lubricated symmetrical three-lobed bearing

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