Lubrication Approximation for Fluids with Shear-Dependent Viscosity

Pereira, Bárbara; Dias, Gonçalo; Cal, Filipe S.; Rajagopal, Κ. R.; Videman, Juha H.

doi:10.3390/fluids4020098

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…As a result, the load-carrying capacity of the journal bearing may increase as the frictional force decreases due to slip. From the modeling point of view, the power-law model is often used to express the non-Newtonian characteristics [26][27][28][29][30]. An interesting review was presented by Dang et al [31], who revealed that non-Newtonian lubricants demonstrated improved journal bearing performance when compared to Newtonian lubricants operating under specific conditions.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of Newtonian and Non-Newtonian Fluid on a Heterogeneous Slip/No-Slip Journal Bearing System Based on CFD-FSI Method

Tauviqirrahman

Jamari

Susilowati

et al. 2022

Fluids

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It is a well-known fact that incorporating a slip boundary into the contact surfaces improves bearing performance significantly. Regrettably, no research into the effect of slip on the behavior of journal bearing systems operating with non-Newtonian lubricants has been conducted thus far. The main purpose of this work is to explore the performance comparison of Newtonian and non-Newtonian fluid on a heterogeneous slip/no-slip journal bearing system. The tribological and acoustic behavior of journal bearing is investigated in this study using a rigorous program that combines CFD (computational fluid dynamics) and two-way FSI (fluid–structure interaction) procedures to simulate Newtonian vs. non-Newtonian conditions with and without slip boundary. The numerical results indicate that irrespective of the lubricant type (i.e., Newtonian or non-Newtonian), an engineered heterogeneous slip/no-slip pattern leads to the improvement of the bearing performance (i.e., increased load-carrying capacity, reduced coefficient of friction, and decreased noise) compared to conventional journal bearing. Furthermore, the influence of the eccentricity ratio is discussed, which confirms that the slip beneficial effect becomes stronger as the eccentricity ratio decreases. It has also been noticed that the Newtonian lubricant is preferable for improving tribological performance, whereas non-Newtonian fluid is recommended for lowering bearing noise.

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Section: Introductionmentioning

confidence: 99%

Performance Comparison of Newtonian and Non-Newtonian Fluid on a Heterogeneous Slip/No-Slip Journal Bearing System Based on CFD-FSI Method

Tauviqirrahman

Jamari

Susilowati

et al. 2022

Fluids

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“…Pereira, et al [19] rigorously derive the Reynolds lubrication approximation for steady flows of incompressible non-Newtonian fluids with shear dependent viscosity. They use a perturbation analysis and show that depending on the power-law character of the fluid, the derived equations can either be prescribed as a higher-order correction to the Reynolds equation or a new type of Reynolds equation for these non-linear fluids.…”

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confidence: 99%