A Study of the Thermohydrodynamic Performance of a Plain Journal Bearing Comparison Between Theory and Experiments

Ferron, J. R.; Frêne, Jean; Boncompain, R.

doi:10.1115/1.3254632

Cited by 214 publications

(232 citation statements)

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“…Finally, a portion of the heat is conducted through the bearing bushing to the surrounding ambient air. Of course, for journal bearings, convective heat transfer by the lubricant film is most significant [34][35][36]. In both the validation process and engine running conditions, it was assumed that the bearing's outer surface is exposed to the ambient temperature.…”

Section: Thermal Boundary Conditionsmentioning

confidence: 99%

Big End Bearing Losses with Thermal Cavitation Flow Under Cylinder Deactivation

et al. 2015

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The paper presents a mixed thermo-hydrodynamic analysis of elliptic bore bearings using combined solution of Navier-Stokes, continuity and energy equations for multi-phase flow conditions. A vapour transport equation is also included to ensure continuity of flow in the cavitation region for the multiple phases as well as Rayleigh-Plesset to take into account the growth and collapse of cavitation bubbles. This approach removes the need to impose artificial outlet boundary conditions in the form of various cavitation algorithms which are often employed to deal with lubricant film rupture and reformation. The predictions show closer conformance to experimental measurements than have hitherto been reported in the literature. The validated model is then used for the prediction of frictional power losses in big end bearings of modern engines under realistic urban driving conditions. In particular, the effect of cylinder deactivation (CDA) upon engine bearing efficiency is studied. It is shown that bigend bearings losses contribute to an increase in the brake specific fuel consumption with application of CDA contrary to the gains made in fuel pumping losses to the cylinders. The study concludes that implications arising from application of new technologies such as CDA should also include their effect on tribological performance.

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Section: Thermal Boundary Conditionsmentioning

confidence: 99%

Big End Bearing Losses with Thermal Cavitation Flow Under Cylinder Deactivation

et al. 2015

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“…This generalised Reynolds equation has been widely used to model thermal bearings [13][14][15] and has also been employed to explore the impact on film thickness and friction of thick, viscous boundary films [16,17].…”

Section: Journal Bearing Modelmentioning

confidence: 99%

Shear Thinning and Hydrodynamic Friction of Viscosity Modifier-Containing Oils. Part II: Impact of Shear Thinning on Journal Bearing Friction

et al. 2018

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In a companion paper, the temporary shear thinning behaviour of a series of viscosity-modifier (VM)-containing blends was studied over a wide shear rate and temperature range [Marx et al. in Tribol Lett, https ://doi.org/10.1007/s1124 9-018-1039-5]. It was found that for almost all VMs the resulting data could be collapsed on a single viscosity versus reduced strain rate curve using time-temperature superposition. This made it possible to derive a single equation to describe the viscosityshear rate behaviour for each VM blend. In the current paper, these shear thinning equations are used in a Reynolds-based hydrodynamic lubrication model to explore and compare the impact of different VMs on the film thickness and friction of a lubricated, isothermal journal bearing. It is found that VMs reduce friction and especially power loss markedly at high shaft speeds, while still contributing to increased hydrodynamic film thickness at low speeds. The model indicates that VMs can contribute to reducing friction in two separate ways. One is via shear thinning. This occurs especially at high bearing speeds when shear rates are large and can result in a 50% friction reduction compared to the equivalent isoviscous oil at low temperatures for the blends studied. The second is via their impact on viscosity index, which means that for a set viscosity at high temperature the low-shear-rate (and thus the high shear rate) viscosity of a high-VI oil, and consequently its hydrodynamic friction, will be lower at low temperatures than that of a low-VI oil. The identification and quantification of these two alternative ways to reduce friction should assist in the design of new, fuel-efficient VMs.

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“…On the other hand, for large-scale hydrodynamic bearings, many researchers have tackled the subject theoretically using THL theory [8,9]. Furthermore, experimental studies of journal bearings have been performed by Mitsui et al [ 10], Ferron et al [11], Gethin and Medwell [ 12], and Wang et al [ 13 ]; experimental studies of thrust bearings have been performed by Homer et al [ 14] and Fillon et al [15]. Kazama et al quantitatively examined the thermohydrodynamic performance of circular pad hydrostatic thrust bearings [ 16] including the effect of the changes in physical properties of fluids as functions of temperature and pressure.…”

Section: Introductionmentioning

confidence: 99%

Temperature Measurement of Tribological Parts in Swash-Plate Type Axial Piston Pumps

Kazama¹,

Tsuruno²,

Sasaki³

2008

Proceedings of the JFPS International Symposium on Fluid Power

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Temperatures of a swash plate, cylinder block, and a valve plate of swash-plate type axial piston pumps with a rotating cylinder block and a rotating swash plate were measured. Thermocouples were embedded underneath these parts . Hydraulic mineral oils with ISO VG22, 32, 46, and 68 and a water-glycol type hydraulic fluid with VG32 were used as test fluids. The maximum discharge pressure was 20 MPa and the maximum rotational speed was 28.3 rps. The inlet oil temperatures were specified as 293-313 K. At the atmospheric pressure to the maximum discharge pressure , the temperatures, flow rates, and the torque were measured. Results support the following conclusions: i) as the discharge pressure increased, the temperatures of the swash plate, cylinder block, and the valve plate increased in almost direct relation; ii) the cylinder block temperature at the bottom dead center of the pistons increased markedly; iii) the temperature increases using the water-glycol fluid were noticeably smaller than the rises using the mineral oils; and iv) the temperature rises became large for higher fluid viscosity and lower inlet oil temperature.

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A Study of the Thermohydrodynamic Performance of a Plain Journal Bearing Comparison Between Theory and Experiments

Cited by 214 publications

References 0 publications

Big End Bearing Losses with Thermal Cavitation Flow Under Cylinder Deactivation

Big End Bearing Losses with Thermal Cavitation Flow Under Cylinder Deactivation

Shear Thinning and Hydrodynamic Friction of Viscosity Modifier-Containing Oils. Part II: Impact of Shear Thinning on Journal Bearing Friction

Temperature Measurement of Tribological Parts in Swash-Plate Type Axial Piston Pumps

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