An Efficient Numerical Procedure for Thermohydrodynamic Analysis of
                    Cavitating Bearings

Vijayaraghavan, D.

doi:10.1115/1.2831574

Cited by 24 publications

(12 citation statements)

References 26 publications

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“…Comparison between the results obtained by the second and third model with experiment indicates that the third model works better than the other one to predict the thermal behavior of journal bearing. Besides, it is seen from Figs 7 and 9 that the temperature distribution obtained from the third model is in more agreement with experiment in comparison to those obtained theoretically in references [6] and [8].…”

Section: Resultssupporting

confidence: 83%

“…Besides, in Figs 7 and 9, a comparison is made between the present numerical results with those obtained theoretically by Vijayaraghavan [6] and Mistry et al [8].…”

Section: Resultsmentioning

confidence: 54%

“…Moreover, it was shown that when shearing losses in the cavitated region were calculated based on the shearing of air instead of oil, the temperature distribution in the cavitated region showed a remarkable agreement with that obtained experimentally. An efficient numerical procedure for THD analysis of cavitating bearings was introduced byVijayaraghavan [6]. The procedure was based on the earlier development of Elrod [7] for lubricating films.…”

Section: Introductionmentioning

confidence: 99%

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Thermohydrodynamic analysis of cavitating journal bearings using three different cavitation models

Nassab

Maneshian

2007

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this paper, a thermohydrodynamic (THD) analysis of vapour cavitation in steady loaded and finite length journal bearing has been developed using three different cavitation models. It involves the simultaneous solution of the three-dimensional Navier-Stokes and energy equations by CFD technique. An orthogonal grid is generated using analytic transformation functions and the governing equations are transformed for use in the computational plane. These equations are made discrete by means of control volume method and the well-known SIMPLE algorithm is used for the pressure-velocity calculation. In the cavitated part of the lubricant flow with a mixture of vapour and liquid, three different cavitation models are used to obtain the thermal behaviour of lubricant flow in this region. In all of the three cavitation models, an attempt is made to replace a single phase fluid with equivalent properties instead of the mixture of liquid and vapour. The calculated results are compared with the theoretical results of other investigators and also with experiment, and the abilities of the proposed cavitation models to predict THD characteristics of journal bearings are examined. The numerical results show that the third model in which the liquid fraction is calculated based on continuity requirement for three-dimensional cavitated flow, predicts well the lubricant pressure and temperature fields in journal bearings.can either be a result of: (1) dissolved gas coming out of the solution or (2) evaporation of the fluid. Both types of cavitation are commonly observed in journal bearings. The occurrence of cavitation in journal bearings is shown to result in reduced power loss, friction coefficient, bearing torque and load capacity [1].Computed performance characteristics of a journal bearing depend significantly on the cavitated model and the related boundary conditions used in the analysis. For the steadily loaded journal bearings under laminar flow and isothermal conditions, several boundary conditions in the cavitated region have been proposed, some of which are listed in a paper by Mori and Mori [2].A computational cavitation algorithm was introduced by Elrod [3] which can be used in liquidfilm lubrication problems with or without cavitation region. In that work, a single 'universal' differential equation for the whole lubrication region was derived JET238 Fig. 7 Bush inner surface temperature distribution of the Mistry's bearing c/r s = 0.004, Re = 7.2, ε = 0.15, L/D = 0.5 JET238

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Section: Resultssupporting

confidence: 83%

“…Besides, in Figs 7 and 9, a comparison is made between the present numerical results with those obtained theoretically by Vijayaraghavan [6] and Mistry et al [8].…”

Section: Resultsmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

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Thermohydrodynamic analysis of cavitating journal bearings using three different cavitation models

Nassab

Maneshian

2007

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…In 1996, Vijayaraghavan published the dimensionless modified Elrod's equation [14], which is capable of taking into account the thermal phenomenon in the lubricant film:…”

Section: Elrod's Model In the Thermohydrodynamic (Thd) Regimementioning

confidence: 99%

Experimental and Numerical Analysis on the Seizure of a Carbon-Filled PTFE Central Groove Journal Bearing during Start-Up Period

et al. 2018

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During the start-up period, if the journals bearing bushing and shaft materials have different heat conductivities, the thermal expansion of the shaft might be more rapid than that of the bushing. This reduces the radial clearance between the bearing components and generates higher shear stresses in the lubricating fluid, which can lead to bearing seizure, resulting in the deterioration of the journal bearing.(1) First, we present an experimental case study of the seizure of a central groove journal bearing with a carbon-filled polytetrafluoroethylene (PTFE) bushing and a steel shaft; (2) Then, a static thermoelastohydrodynamic (TEHD) simulation is compared to Cristea's experiments (Cristea, A.-F., 2012); (3) Then, a pseudo-transient TEHD simulation is performed in order to numerically predict the observed phenomena on the test rig; (4) Finally, the evolution of the oil flow rate and the bushing temperatures during the start-up period determined with the pseudo-transient TEHD modelling are compared to the experimental data of the test rig. The pressure field is determined with the thermohydrodynamic (THD) Elrod's modelling, with Vijayaraghvan's robust solver algorithm. The pseudo-transient temperature field in the bearing components as well as the thermal and mechanical deformations are calculated with a commercial software.

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“…They concluded that most of the heat generated is evacuated by the fluid flow and that the temperature gradients across and along fluid-film are important. An efficient THD numerical procedure was developed by Vijayaraghavan [3] to analyze journal bearing performance. The conduction through the bearing and journal has been considered to accurately predict the temperature and pressure distribution.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of Orifice-Compensated Symmetric Hole-Entry Hybrid Journal Bearings

Garg¹

2011

J Eng Technol

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An Efficient Numerical Procedure for Thermohydrodynamic Analysis of Cavitating Bearings

Cited by 24 publications

References 26 publications

Thermohydrodynamic analysis of cavitating journal bearings using three different cavitation models

Thermohydrodynamic analysis of cavitating journal bearings using three different cavitation models

Experimental and Numerical Analysis on the Seizure of a Carbon-Filled PTFE Central Groove Journal Bearing during Start-Up Period

Thermal Analysis of Orifice-Compensated Symmetric Hole-Entry Hybrid Journal Bearings

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