Performance analysis of textured journal bearing operating with and without nanoparticles in the lubricant

Byotra, Deepak; Sharma, Sanjay

doi:10.1108/ilt-03-2022-0078

Cited by 7 publications

(16 citation statements)

References 27 publications

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“…Comparative analysis of these texture shapes can provide the most effective shape and optimal operating parameters for enhancing the performance of hydrodynamic journal bearings. Figure 2(A) displays the circle, ellipse, rectangular, triangular, chevron and arc shapes and their corresponding geometric equations (a–f) as described by Manser et al (2019), Qiu et al (2013), Sharma et al (2020) and Byotra and Sharma (2022), which are all used in the present study.…”

Section: Methodsmentioning

confidence: 99%

“…Existing literature also indicates that partial surface texturing can enhance the dynamic performance and stability of bearings. The goal of the study is to compare the various texture shapes, including the novel arc shape, an extended work of the same author's Byotra and Sharma (2022), in which the effect of arc shape textures on steady state performance of bearing being studied. In continuation/extension of previous work, the lubricant dynamic characteristics of novel arc and other shapes of textures are considered in the present work.…”

Section: Introductionmentioning

confidence: 99%

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Effect of texture shapes and additives in lubricants on the dynamic characteristics of the hydrodynamic journal bearing

Byotra,

Sharma

2023

ILT

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Purpose This study aims to understand how the texture shape, number of textures and addition of nanoparticle additives in lubricants impact the dynamic characteristics of journal bearing by comparing six different texture shapes like triangle, chevron, arc, circle, rectangle and elliptical applied in pressure-increasing region under various geometrical and operating conditions. Design/methodology/approach The finite element method approach has been employed to solve governing Reynold’s equation, assuming iso-viscous Newtonian fluid, for computation of performance parameters like stiffness and damping coefficient, threshold speed, etc. By using a regression model, the impact of adding nanoparticles Al2O3 and CuO to the base lubricant on viscosity variation is calculated for selected temperature ranges and weight fractions of nanoparticles. Findings The arc-shaped texture with an area density of 28.27%, eccentricity ratio of 0.2 and texture depth of 0.6 exhibited 35.22% higher direct stiffness and 41.4% higher damping coefficient compared to the lowest value in the circle-shaped texture. Increasing the number of arc-shaped textures on the bearing surface with low area density led to declining stiffness and damping parameters. However, with nanoparticle additives, the arc-shaped texture further showed 10.75% and 8.11% improvement in stiffness and 9.99% and 4.87% enhancement in damping coefficient for Al2O3 and CuO, respectively, at 90 °C temperature and 0.5% weight fraction. Originality/value By understanding the influence of texture shapes on the dynamic characteristics, engineers can design bearings that exhibit improved stability and enhance overall performance.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of texture shapes and additives in lubricants on the dynamic characteristics of the hydrodynamic journal bearing

Byotra,

Sharma

2023

ILT

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“…Partial texturing gives a higher load-carrying capacity than full texturing. Partial texturing between 180° to 360° gives better results in Researchers have employed FEM [57][58][59]70] for discretizing the governing equation in algebraic form. Table 2 presents the summary of articles involving isothermal investigations without considering cavitation effects using FEM.…”

Section: Numerical Investigations On the Performance Of Textured Jour...mentioning

confidence: 99%

A Review of Performance of Textured Journal Bearing

Mishra,

Aggarwal

2023

Tribology Online

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Due to emerging concerns for energy-efficient and environment-friendly journal bearings, efforts are being made to improve their performance behaviours. Green tribology also aims to reduce friction and wear. In this direction, surface textures are employed on the surfaces of mating parts to minimize friction and enhance load-carrying capacity. Surface textures comprising numerous microgeometries such as dimples, grooves or pits are found to be capable of increasing bearing performance. In this article, findings of numerical and experimental investigations on the performance of textured journal bearings have been summarized. It is found that the presence of texture on the bearing surface yields lower friction and higher load-carrying capacity. This article concludes by discussing the effect of texture parameters on the performance characteristics of the journal bearing.

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“…Byotra and Sharma [31] developed a finite element model to analyze the performance improvement of a journal bearing by applying the arc-shaped textures on various regions of bearing operating with and without nanolubricants. They observed that the addition of Al 2 O 3 and CuO NPs increased the carrying-load capacity.…”

Section: Introductionmentioning

confidence: 99%

Elasto-hydrodynamic lubrication analysis of a porous misaligned crankshaft bearing operating with nanolubricants

Hamel

Lahmar

Said

2023

Mechanics & Industry

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In this paper, the combined effects of the characteristic size and concentration of inorganic fullerene-like tungsten disulphide nanoparticles (IF-WS2 NPs) or molybdenum disulphide nanoparticles (IF-MoS2 NPs) on the nonlinear dynamic behaviour of a gasoline engine crankshaft bearing subject to an arbitrary force torsor (effective applied force and moment vector) are theoretically and numerically investigated using the V. K. Stokes micro-continuum theory. These NPs are the most common additives for lubrication purposes due to their excellent tribological characteristics along with their effect on reducing friction and wear. It is assumed that the journal (crankshaft) currently made of a forged steel is rigid and the main bearing consists of a thin poroelastic liner made of low elastic modulus materials like Babbitt metals fixed in a stiff housing as defined by ASTM B23-00. The Krieger-Dougherty law is included in the proposed EHD model to account for the viscosity variation with respect to the volume fraction of nanoparticles dispersed in the base lubricant. On the other hand, the characteristic size of nanomaterials is introduced by a new material entity, denoted l, which is responsible for a couple-stress property. The Reynolds equation is derived in transient conditions and modified to account for the size of nanoparticles and the bearing-liner permeability property. For an arbitrary force torsor, the hydrodynamic pressure distribution, the squeeze film velocities, and the misalignment angular velocities are determined simultaneously by solving the discretized Reynolds equation and the equilibrium equations with the damped Newton-Raphson iterative method at each crank angle step. The crankshaft center trajectories in three sections of the main journal axis as well as the misalignment angles are deduced from the squeeze film velocities and the misalignment angular velocities by means of a Runge-Kutta scheme. According to the obtained results, the combined effects of the size and concentration of fullerene-like nanoparticles on the dynamic behavior of a compliant dynamically loaded crankshaft bearing operating with dynamic misalignment are significant and cannot be overlooked.

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Performance analysis of textured journal bearing operating with and without nanoparticles in the lubricant

Cited by 7 publications

References 27 publications

Effect of texture shapes and additives in lubricants on the dynamic characteristics of the hydrodynamic journal bearing

Effect of texture shapes and additives in lubricants on the dynamic characteristics of the hydrodynamic journal bearing

A Review of Performance of Textured Journal Bearing

Elasto-hydrodynamic lubrication analysis of a porous misaligned crankshaft bearing operating with nanolubricants

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