A theoretical study of the effect of solid particles in the lubricant of a partial journal bearing

Mahanti, A. C.

doi:10.1016/0043-1648(76)90221-0

Cited by 8 publications

(11 citation statements)

References 2 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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“…Therefore, the theory [11,12] of micropolar fluids, which are characterized by the presence of suspended rigid microstructure particles, has been applied to solve the lubrication problems of such fluids. Theoretical investigations [13][14][15][16][17][18][19][20] on the theory of micropolar lubrication in journal bearings under the steady state condition have been initiated with the investigation of Allen and Kline [21].…”

Section: Introductionmentioning

confidence: 99%

On the conical whirl instability of hydrodynamic journal bearings lubricated with micropolar fluids

Das

Guha

Chattopadhyay

2001

Proceedings of the Institution of Mechanical Engineers, Part J:

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A linear analysis of conical whirl instability of an unloaded rigid rotor supported on hydrodynamic journal bearings with micropolar lubrication has been presented. In self-excited conical whirling motion, the rotor has 2 degrees of freedom with hydrdynamic film pressure distribution in the bearing clearance. The hydrodynamic film pressure distribution has been obtained by solving the modified Reynolds equation based on the theory of the micropolar lubrication satisfying the appropriate boundary conditions. With the help of the components of dynamic tilting stiffness and damping coefficients, stability characteristics are obtained. The effects of various parameters, namely the non-dimensional micropolar characteristic length, coupling number, clearance ratio and slenderness ratio on the conical stability parameter have been investigated.

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“…The micropolar theory of fluids proposed by Eringen 3 and Allen and Kline 6 was applied in the lubrication analysis of different configuration of bearings such as slider, 26,28,29,32 thrust, 9,11,16,42 step slider, 19,27 and journal bearings. 14,20,22,23,52 The results showed an appreciable variation in the performance of the above bearings with micropolar lubricant as compared to Newtonian lubricant. Prakash and Sinha 45 explained the concept of microcontinuum fluid flow in detail by considering the effect of the above-defined micropolar viscosity coefficients separately.…”

Section: Micropolar Theory For Lubricationmentioning

confidence: 94%

“…Squeeze film action in different bearings with micropolar lubrication was analyzed by various researchers. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] The time of approach or response time for a micropolar fluid was observed to be greater than the corresponding time predicted by Newtonian theory. Slider bearing configurations (one to three dimensional) lubricated with micropolar fluid were studied by various researchers.…”

Section: Introductionmentioning

confidence: 99%

Influence of micropolar lubricant on bearings performance: A review

Khatak

Garg

2012

Proceedings of the Institution of Mechanical Engineers, Part J:

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This article presents the applicability of the microcontinuum theories to the fluid in sliding surfaces. The classical continuum mechanics fails to predict the accurate results when the geometric volume under consideration becomes comparable to the material dimensions. The fluid in the presence of microstructures and in the space comparable to the clearance of bearings showed unexpected variations in its properties as per the experimental observations. A general class of micropolar fluid was defined by considering the microrotation vector of its particles. This review critically analyzes the microrotation of lubricant additives and its effects on static and dynamic characteristics of the bearings.

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A theoretical study of the effect of solid particles in the lubricant of a partial journal bearing

Cited by 8 publications

References 2 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

On the conical whirl instability of hydrodynamic journal bearings lubricated with micropolar fluids

Influence of micropolar lubricant on bearings performance: A review

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