Experimental evaluation of lubricating oil film pressure and temperarture of elliptical non-circular journal bearing profile

Singla, Amit; Chauhan, Amit

doi:10.1109/raecs.2015.7453334

Cited by 9 publications

(8 citation statements)

References 24 publications

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“…As lubricants play a major role in hydrodynamic bearings, three different viscosity grades of mineral based lubricating oils 2,43 of Gulf make have been selected for examining the static performance of elliptical bearing. These oils, namely AW32, AW68 and AW100 have been labeled as LO1, LO2 and LO3, respectively for further discussion.…”

Section: Details Of Modeling Parametersmentioning

confidence: 99%

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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: Details Of Modeling Parametersmentioning

confidence: 99%

“…Bearing is assumed with minor axis of 100.2 mm and major axis of 100.4 mm. Bearing dimensions have been chosen as per study done by Singla and Chauhan 43 for generating a model. The speed of the journal varies from 2000 to 5000 rpm with an interval of 1000 rpm.…”

Section: Details Of Modeling Parametersmentioning

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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“…It was observed that the bearing characteristics were greatly affected by the elastic deformation of the bearing surfaces. The effect of oil film temperature on the performance of elliptical journal bearing considering different loads and speeds was studied numerically by Chauhan et al [7] and experimentally by Singla and Chauhan [8] and [9]. The obtained results depict that the temperature and pressure at the mid plane of the bearing increased for higher journal speed and bearing eccentricity ratio while the oil film temperature decreases for the bearing with higher ellipticity factor.…”

Section: Introductionmentioning

confidence: 99%

Effect of micro protrusions on the performance of elliptical journal bearings operating with couple stress lubricant

Abass¹,

Mahdi²

2021

Diagnostyka

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Elliptical bearing is characterized by low induced temperature and high stability at higher speed in comparison with the cylindrical journal bearing. The performance of such bearings can be affected by the type of oil used and its surface properties. The main goal of this work is to study the surface micro protrusion effect on the steady state operation of elliptical journal bearing lubricated with couple stress lubricant. The modified Reynolds' equation to take into account the effects of couple stress lubricant and micro protrusions of the bearing surfaces is solved using finite difference method. The governing equations were solved using a prepared FORTRAN computer program. Pressure distribution, load carrying capacity and coefficient of friction have been studied for a bearing in laminar flow regime. The mathematical model was validated by comparing pressure results for the elliptical bearing of the present work with that obtained by Hussain et al.(1996). The obtained results demonstrate that the lubricant pressure and the load carried by the bearing decrease for the bearing with higher ellipticity factor while the load carried by the bearing increases for the bearing with higher protrusions or when using a couple stress fluid with higher couple stress variable.

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“…15 Singla and Chauhan experimentally studied oil film pressure and temperature of an elliptical journal bearing, and they experimentally showed pressure and temperature profile with different load and speed. 16 Suryawanshi and Pattiwar studied the effect of blending TiO 2 nanoparticles with lubricating oil on the performance parameters of the elliptical journal bearing and plain bearing. They studied parameters such as pressure distribution, loadcarrying capacity, attitude angle, power loss, oil flow rate, side leakage, frictional force, and temperature rise in a film.…”

Section: Introductionmentioning

confidence: 99%

Geometrical analysis of elliptical journal bearings and its effects on friction and load capacity

Ebrahimi

Akbarzadeh

Moosavi

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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Elliptical bearings are one type of non-circular journal bearings which has two main advantages over the conventional circular bearings: lower temperature rise and lower vibrations. In this study, the energy equation and Reynolds equation are simultaneously solved under adiabatic boundary conditions. The predicted pressure and temperature are compared to the results of published literature for verification purposes. A parametric study is then conducted on the effect of geometrical parameters of the elliptical journal bearing on the load capacity, friction force, pressure, and oil temperature. Effect of geometric parameters of the bearing on the performance is studied. The results show that non-circularity parameter is the most influential parameter in the bearing, and an increase in the non-circularity results in the decrease in maximum pressure and temperature as well as the friction force. Increasing the eccentricity ratio, on the other hand, will cause an increase in the pressure, temperature, and the friction force. Changes in the angle between the major axis of the bearing and load direction decrease the load-carrying capacity and the non-dimensional pressure and results in an increase in the friction coefficient.

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Experimental evaluation of lubricating oil film pressure and temperarture of elliptical non-circular journal bearing profile

Cited by 9 publications

References 24 publications

Static thermal performance evaluation of elliptical journal bearings with nanolubricants

Static thermal performance evaluation of elliptical journal bearings with nanolubricants

Effect of micro protrusions on the performance of elliptical journal bearings operating with couple stress lubricant

Geometrical analysis of elliptical journal bearings and its effects on friction and load capacity

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