A Study of the Thermohydrodynamic Performance of Steadily Loaded Journal Bearings

Paranjpe, Rohit S.; Han, Taeyoung

doi:10.1080/10402009408983347

Cited by 46 publications

(17 citation statements)

References 19 publications

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“…Khonsari and Wang [1] proposed a simplified model with an uncoupled analysis of the Reynolds and energy equations using adiabatic thermal boundary conditions. Paranjpe and Han [2] used a full three-dimensional (3D) energy equation with hot oil mixing in the groove, and defined a continuous heat flux at fluid-solid interfaces for a crankshaft bearing. A similar model was modified by Kucinschi et al [3] to describe the thermal expansion of journal and bearing.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigations on Transient Run-Up Procedures of Journal Bearings Including Mixed Friction Conditions

et al. 2018

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This paper focuses on the operating behavior of journal bearings for industrial machinery application during run-ups. For this purpose, a numerical simulation code that is based on a two-dimensional extended and generalized Reynolds equation and a full three-dimensional energy equation, was advanced by a theoretical model considering the effects of mixed friction and warming of journal components during start-up. The mixed friction routine contained the elastic half-spaces model proposed by Boussinesq, which considers the influence of rough surfaces by implementing flow factors and calculates additional stiffness and dissipation in areas with solid interactions. Furthermore, a transient term was added in the energy equation to consider the thermal inertia of journal, and bearing to ensure a realistic heating during run-ups. Results of the prediction were compared to experimental data taken from a special test rig built up for validation procedures. Besides the conventional sensors for temperature, oil flow, and relative motion between shaft and stator, a contact voltage measurement was installed to determine the intensity of mixed friction. The evaluation of experimental data by Stribeck curves, based on a shaft torsion measurement, indicated a significant influence of run-up time on frictional moment. The friction coefficient of the rotor bearing system was strongly influenced by the run-up time. A short run-up time reduced the frictional coefficient in the mixed lubrication regime while the opposite behavior was observed in the hydrodynamic lubrication regime. The numerical code predicted these tendencies in good agreement with experimental data, however, only if the transient energy model was applied.

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Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigations on Transient Run-Up Procedures of Journal Bearings Including Mixed Friction Conditions

et al. 2018

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“…According to their results, the axial temperature variation was negligible, but the circumferential temperature variation could be very significant. A comprehensive thermohydrodynamic analysis of steadily loaded journal bearing has been developed by Paranjpe and Han, which includes mass‐conserving cavitation. They obtained the temperature distribution in the oil film and bushing using a coupled approach where the three‐dimensional energy equation is solved in both the oil film and bushing.…”

Section: Introductionmentioning

confidence: 99%

A study of thermal effects in an offset‐halves journal bearing profile using different grade oils

Chauhan

Sehgal

Sharma

2011

Lubrication Science

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The Reynolds equation has been solved simultaneously along with the energy equation and heat conduction equation by finite difference method to find pressure and temperature distribution for circular and offsethalves journal bearings. Numerical solution of energy equation was achieved using parabolic temperature profile approximation technique for faster computation. A comparative study for the rise in oil temperatures, thermal pressures and load-carrying capacity for the three different commercially available oils namely Hydrol 68, Mak 2T and Mak Multigrade (Bharat Petroleum Corporation Limited [BPCL], Mumbai, India) has been carried out. With an increase in speed, the oil temperature, the thermal pressure and the load-carrying capacity rose for all the grade oils under study. The rise in computed oil temperature, thermal pressures as well as load-carrying capacity has been found maximum for Mak Multigrade oil and minimum for Mak 2T oil. The nature of temperature profiles and load-carrying capacity has been found to be in good agreement with those available in the literature.

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“…A numerical solution of the thermal problem in journal bearings can be broadly classified into three main categories -those that use the finite volume (FV), finite difference (FD), and finite element (FE) methods. Significant contributions in the former include the work of Paranjpe and Goenka (4) and Paranjpe and Han (5), (6). Stachowiak and Batchelor (7) present a numerical FD model while Booker and Huebner (8), Goenka (9), Labouff and Booker (10), Bayada,et al (11), and Kucinschi, et al (12) use FE.…”

Section: Introductionmentioning

confidence: 98%

Hydrodynamic and Thermal Behavior of Journal Bearings using Upwind Petrov-Galerkin FEM

Zengeya

Gadala

Segal

2007

Tribology Transactions

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A novel approach to modeling plain journal bearings is presented. The journal is assumed to be cut open at the oil supply groove and modeled in Cartesian coordinates. The streamline upwind Petrov-Galerkin (SUPG) finite element method is used to develop the three-dimensional model. The model is validated using Boncompain, Costa, and Dowson's experimental data and compared to Khonsari's analytical method. The maximum deviation from the measured temperatures is 10 per cent for Costa's data and the predictions of 51.2 • C from the model are 0.3 • C lower than Dowson's experimentally measured peak temperature. The model shows rapid convergence, stabilizing in only three iterations. The cavitation interface thermal boundary conditions need not be specified. Side leakage predictions are within 2.8 percent of the measured value whereas Martin's analytical method achieves an accuracy of 11.2 percent.

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A Study of the Thermohydrodynamic Performance of Steadily Loaded Journal Bearings

Cited by 46 publications

References 19 publications

Theoretical and Experimental Investigations on Transient Run-Up Procedures of Journal Bearings Including Mixed Friction Conditions

Theoretical and Experimental Investigations on Transient Run-Up Procedures of Journal Bearings Including Mixed Friction Conditions

A study of thermal effects in an offset‐halves journal bearing profile using different grade oils

Hydrodynamic and Thermal Behavior of Journal Bearings using Upwind Petrov-Galerkin FEM

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