Static characteristics of thermohydrodynamic journal bearing operating under lubricants containing nanoparticles

Kalakada, Sreedhar Babu; Kumarapillai, Prabhakaran Nair; K, Rajendra Kumar P

doi:10.1108/ilt-01-2013-0015

Cited by 25 publications

(40 citation statements)

References 23 publications

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“…The similar behaviour has also been reported by Razavykia et al 48 that the power loss decreases with the reduction in viscosity and moreover, temperature rise is more for higher viscosity oils at higher eccentricity ratios. Further, it is evident that power loss is increased with increase in concentration of nanoparticles and this is attributed to the fact that on increasing the nanoparticle concentration, resistance offered by viscous force get increased which results increase in friction force and hence power loss as explained in Kalakada et al 21 Although direct comparison of static performance characteristics results obtained in this study cannot be substantially made due to the considerations of different journal bearing configurations and operating parameters in the literature, some researchers have studied the effect of nanolubricants on THD analysis of journal bearings. The findings obtained in the proposed model have been found to be in good agreement with the similar published studies related to CuO and TiO 2 based nanolubricants.…”

Section: Power Loss Calculationsmentioning

confidence: 90%

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Static thermal performance evaluation of elliptical journal bearings with nanolubricants

Dang¹,

Chauhan

Dhami

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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Journal bearings of different configurations have been extensively used in turbomachinery and power generating equipments. Although circular bearings have simplest configuration and commonly used journal bearings, non-circular bearings such as multi-lobe and elliptical bearings have an added advantage of lower lubrication film temperature alongwith stable operation. In this study, static thermal performance of pure elliptical bearing lubricated with nanoparticles based mineral oils has been studied at different eccentricity ratios and bearing speeds. Two types of nanoparticles, namely, CuO and TiO2 with 0.5, 1.0 and 2.0 wt.% concentrations have been separately added in three different viscosity grades of oils. The effect of nanoparticles on thermo-physical properties of oil was considered to compute bearing performance parameters (pressure distribution, load capacity, oil temperature and power losses). Bearing model was generated by taking into account the modified Krieger Dougherty method to determine viscosity at different combinations of oils and nanoparticles. The findings indicate the increase in maximum pressure and load capacity with addition of nanoparticles and this increase was more pronounced at higher concentrations of nanoparticles and at higher viscosity grade oils. Load capacity was found to be increased by 14.24% and 9.21% with 2 wt% concentration of TiO2 and CuO nanoparticles respectively in base oil (AW68) at eccentricity ratio of 0.7. An increase in load capacity with nanolubricants was achieved without an appreciable increase in oil temperature.

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Section: Power Loss Calculationsmentioning

confidence: 90%

“…Reynolds equation 2,3,6,21 for incompressible flow under steady state conditions with standard assumptions can be expressed as…”

Section: Reynolds Equationmentioning

confidence: 99%

Static thermal performance evaluation of elliptical journal bearings with nanolubricants

Dang¹,

Chauhan

Dhami

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…As a result, the pressure generated inside the bearing under state steady conditions for incompressible fluid is governed by Reynolds equation as expressed in Eq. ( 1) [5], [23], [32]:…”

Section: Bearing Performance Characteristic Equationsmentioning

confidence: 99%

“…Load capacity and friction force were found to be increased with an increase of nanoparticles concentration. Kalakada et al [23] also used these three nanoparticles in different concentrations to study the effect of variation in viscosity with change in temperature for monitoring bearing performance. There was an improvement in static and dynamic performance and CuO based nanolubricant was found to be the best performing lubricant.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO2 and CuO Based Nanolubricants on the Static Thermal Performance of Circular Journal Bearings

Dang¹,

Dhami²,

Goyal³

et al. 2021

Tribol. Ind.

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Circular journal bearings constitute the heart of power generation equipments due to their simple design, ease in manufacturing and high loadcarrying capacity. Hydrodynamic action in these bearings is manifested by the presence of a single oil film, which increases the oil film temperature at higher loads. However, in order to improve the performance of bearings and for overall optimization of equipment efficiency, lubricants with specialized additives are being explored. With the advancements in nanotechnology, lubricants have been blended with nanoparticles for enhancing tribological characteristics. The existing studies are more focused on examining the influence of nanolubricants for boundary lubrication regime. Hence, this article investigates the effect of CuO and TiO2 based nanolubricants in hydrodynamic lubrication regime by studying the static thermal characteristics of circular bearing. Comparative performance analysis has been conducted with both the nanoparticles based lubricants at different concentrations by mixing them in two mineral-based oils having different viscosities. The modified Krieger Dougherty method has been applied for determining the viscosity of nanolubricants. Hydrodynamic pressure and oil film temperature calculations have been performed by developing a model in MATLAB ® R2020a software by considering the effect of variation in the thermophysical properties of nanolubricants. There has been a significant increase in load capacity with just small rise in oil film temperature with the use of nanolubricants. Load capacity with 2wt% addition of TiO2 increased by 14.23% at a journal speed of 2000rpm and eccentricity ratio of 0.6, while there was an increase of 9.23% in the case of CuO at the same parameters. The proposed methodology has an enormous potential for assessing the performance enhancement of turbomachinery used for power generation.

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“…Kacou et al (1988) examined the thermohydrodynamic behavior of journal bearing with non-Newtonian lubricant. Recently, Kalakada and Kumarapillai (2015) proposed the nanolubricant thermo-hydrodynamic model and investigated the static characteristics of journal bearing.…”

Section: Introductionmentioning

confidence: 99%

Magneto-rheological fluid slot-entry journal bearing considering thermal effects

Sahu

Sharma

2019

Journal of Intelligent Material Systems and Structures

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In recent times, controlling the performance of fluid film bearings smartly has become an important area for the fluid film bearing designers. This study deals with the numerical simulation of a magneto-rheological fluid–lubricated two-lobe hybrid slot-entry journal bearing. To make the operating condition more exact and realistic, the influence of geometric imperfection of the journal arising from manufacturing inaccuracies and thermal effect has been considered. Dave magneto-rheological fluid model, a constitutive relation of the Bingham model, and finite element method have been used in this article to simulate the behavior of the magneto-rheological fluid in a slot-entry bearing. The results indicate that the heat generated because of viscous friction rises the temperature of the magneto-rheological fluid, which changes the bearing performance significantly. Considering barrel-shaped journal and magneto-rheological fluid (applied current, Ic = 4 A), the performance of two-lobe slot-entry bearing is superior in terms of the value of [Formula: see text] approximately by a magnitude of 2%, 41%, 181%, 168%, 75%, and 41%, respectively, as compared to that of the base bearing (smooth [Formula: see text], two-lobe bearing, operating with a Newtonian fluid, Ic = 0 A).

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Static characteristics of thermohydrodynamic journal bearing operating under lubricants containing nanoparticles

Cited by 25 publications

References 23 publications

Static thermal performance evaluation of elliptical journal bearings with nanolubricants

Static thermal performance evaluation of elliptical journal bearings with nanolubricants

Effect of TiO2 and CuO Based Nanolubricants on the Static Thermal Performance of Circular Journal Bearings

Magneto-rheological fluid slot-entry journal bearing considering thermal effects

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