Influence of Elliptic Bore and Non-Newtonian Rheology of Lubricant on the Performance and Stability of Journal Bearing

Rahmani, Faisal; Pandey, R. K.; Dutt, J.K.

doi:10.1016/j.protcy.2016.03.069

Cited by 10 publications

(10 citation statements)

References 19 publications

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“…al. [31] studied the effect of different L/D ratios and ramp size on the dynamic performance of a tri-taper bearing. The stability of a rigid rotor supported on a tri-taper journal bearing, subjected to periodic and variable rotating loads was predicted using a nonlinear transient analysis.…”

Section: Stability Of Bearingsmentioning

confidence: 99%

A Technical Review on the Study of Stability Analysis of Non-Circular Bearings Lubricated with Newtonian/Non-Newtonian Fluids

Murthy

Raghunandana

2019

IJMPERD

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In recent years, applications of non-Newtonian fluids as lubricants have received great interest since the use of these non-Newtonian lubricants showed an increase in load carrying capacity and reduction in frictional force with the escalation in additives concentration. The demands of the present day industry rotating machinery includes high speed, compactness, light weight engines, high operating loads, high power transmission, high efficiency, and high performance of the engine. As a result of high speed machines, bearings are inclined to have excessive power loss and increasein oil temperature. The former reduces the efficiency of the engine and the latter causes the undesired changes in the lubricating oil. The plain journal bearings at high rotation speeds are subjected to instability like oil whirl and whip ruining the bearing and also the machine. Therefore, this poses a need to change in the bearing design. In the present paper, an attempt is made to briefly introduce the various non-linear models used and the different approaches that have been carried out by the researches in the past few years to improve and achieve the stability of journal bearing along with enhanced performances and characteristics.

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Section: Stability Of Bearingsmentioning

confidence: 99%

A Technical Review on the Study of Stability Analysis of Non-Circular Bearings Lubricated with Newtonian/Non-Newtonian Fluids

Murthy

Raghunandana

2019

IJMPERD

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“…According to his research, the load-bearing capacity and pressure increased as the power-law index grew, and the power-law index had a more substantial influence at higher eccentricity ratios. Researchers [17,18] found the power-law model to be more effective and well-suited in analyzing an elliptical bore bearing's performance characteristic with non-Newtonian liquids than the other available modes for examining non-Newtonian fluids. According to Crosby and Chetti, [19] the parameter of couple stress (non-Newtonian fluid) has a considerable impact on bearing performance when compared to Newtonian fluids, resulting in greater stability.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…To summarise the gaps in previous research studies, it is surveyed that in earlier works, researchers focused on the influence of non-Newtonian lubricant on the performance of plain circular bearings [9][10][11]17] or two-lobe bearings. [13][14][15][16][17][18]21] Other studies [1][2] concentrated only on the effect of slip on plain journal bearings or two-lobe bearings. [19] Also, to add to the above gaps, Recently, Das and roy [22] investigated the influence of non-Newtonian lubricant on multilobe bearings, and Rao et al [27] investigated the effect of partial slip with texturing on multilobe bearings using Newtonian fluids.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stability Analysis of a Lemon Bearing Operating with Non-Newtonian Lubricant Considering Slip between the Sliding Surfaces

A¹,

Raghunandana.²

2022

Eng. Sci.

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With the addition of additives, lubricating fluid begins to behave non-linearly. Besides that, the emergence of ultra-highspeed machines with highly polished surfaces causes slip between the sliding surfaces, violating the no-slip boundary condition. The current novel research work looks at the performance of the bearing while considering the combined effect of the non-Newtonian and wall-slip impact of the lubricant. Furthermore, the model developed can account for the influences of slip-lengths acting in orthogonal directions at the solid-fluid interface of both sliding surfaces. This innovative model produces more realistic steady-state and dynamic performance results than the classic Reynolds hypothesis. The finite difference method is employed to determine the pressure developed using the successive over-relaxation approach. The findings divulge that the occurrence of wall-slip on the journal surface significantly impacts bearing performance. The journal center trajectories that determine the system's stability are estimated using non-linear transient analysis. The findings reveal that, at a power-law index of 0.75 and slip-length of 0.2, dimensionless pressure increases by 10%, resulting in higher loadcarrying capacity. The flow rate is increased by 6.5%, and above all, the stability region has grown by about 19.45%.

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“…Many studies were conducted to analyze the effects of this fluid model on the characteristics of various lubricating contacts [12][13][14]. However, journal bearings with different geometrical configurations [15][16][17], operating conditions [18][19][20] and influencing factors [21][22][23] are the most studied sliding bearings. The achieved results indicate unfavorable bearing performances with pseudo-plastic Rabinowitsch lubricant as compared to Newtonian fluid.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of hydrodynamic journal bearing under the combined influence of textured surface and Non-Newtonian Rabinowitsch fluid model

et al. 2021

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In the present study, the static characteristics of hydrodynamic circular journal bearings of finite length are highlighted, using the combined influences of textured surface and non-Newtonian lubricants behavior, obeying to the Rabinowitsch fluid model. The associated nonlinear Rabinowitsch-Reynolds equation has been discretized using finite differences scheme and solved by the mean of Elrod’s algorithm taking into account the presence of cylindrical textures on full/optimum bearing surface. Following to the absence of textures on the bearing surface or the non-Newtonian fluid behavior, the obtained results are in good agreement with the reference ones. The hydrodynamic lubrication static performances are computed for various parameters such as textures location; eccentricity ratio and the rheological coeffcient. The results suggest that texturing the bearing’s convergent zone enhances significantly the load carrying capacity and reduces the friction coeffcient, whereas texturing the full bearing surface may leads to bad performances. It is also noticed that the pseudoplastic lubricant coeffcient decreases the bearing performances (load capacity and pressure) compared to Newtonian fluid cases. Considering the optimal arrangement of textures on the contact surface, a significant improvement in terms of load capacity and friction can be achieved, especially at low pseudoplasticity effect.

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Influence of Elliptic Bore and Non-Newtonian Rheology of Lubricant on the Performance and Stability of Journal Bearing

Cited by 10 publications

References 19 publications

A Technical Review on the Study of Stability Analysis of Non-Circular Bearings Lubricated with Newtonian/Non-Newtonian Fluids

A Technical Review on the Study of Stability Analysis of Non-Circular Bearings Lubricated with Newtonian/Non-Newtonian Fluids

Stability Analysis of a Lemon Bearing Operating with Non-Newtonian Lubricant Considering Slip between the Sliding Surfaces

Behaviour of hydrodynamic journal bearing under the combined influence of textured surface and Non-Newtonian Rabinowitsch fluid model

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