The Influence of Speed, Grease Type, and Temperature on Radial Contaminant Particle Migration in a Double Restriction Seal

Baart, Pieter; Green, T.M.; Li, J.X.; Lundström, T. Staffan; Westerberg, Lars G.; Höglund, Erik; Lugt, Piet M.

doi:10.1080/10402004.2011.609308

Cited by 17 publications

(53 citation statements)

References 13 publications

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“…Radulescu et al [24] investigated the flow in pipes with discontinuities, which also could be applied to the flow in bearings. This work is a continuation of previous studies of the flow in closed straight channels [29,17] and in a 3D double restriction seal geometry [14,1,18]. A channel with a 90 • elbow is used and an analytical model of the flow is developed and combined with experimental data from micro Particle Image Velocimetry (µPIV) measurements of the flow in the elbow.…”

Section: Introductionmentioning

confidence: 97%

Grease flow in an elbow channel

Westerberg

Farré-Lladós

et al. 2015

Tribol Lett

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Lubricating greases are materials characterized by a complex nonNewtonian rheology. This study is a continuation of previous studies on the coupling between grease rheology and grease flow in a straight channel-and concentric cylinder geometry. The problem has been modeled and validated with experiments. Here the flow in an elbow channel introducing a non-symmetric distribution of shear stress throughout the cross section of the channel elbow, as well as varying shear rates through the transition from the channel inlet to the outlet. The flow has been modeled both for higher flow rates and for creep flow. The influence of the grease rheology and flow conditions to wall slip, shear banding and an observed stick-slip type of motion observed for low flow rates are presented. The effect on the flow of the applied pressure is also investigated showing that the flow is sensitive to the pressure in the angular (ϕ) direction of the elbow. For high flow rates it is shown that flow separation occur with a resulting circulation in the elbow.

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Section: Introductionmentioning

confidence: 97%

Grease flow in an elbow channel

Westerberg

Farré-Lladós

et al. 2015

Tribol Lett

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“…We start by summarizing the modeling approach by Baart et al [11] as the numerical model is based on the same equations. Baart et al [11] has used µPIV to measure the velocity profile across the grease pocket at a given plane set by the focal plane of the microscope.…”

Section: Particle Migration Model By Baart Et Al [11]mentioning

confidence: 99%

“…Baart et al [11] has used µPIV to measure the velocity profile across the grease pocket at a given plane set by the focal plane of the microscope. µPIV is a non-intrusive method that uses a high-speed camera connected to a microscope, and synchronized/triggered by a computer, to take images of a particle seeded (grease) flow; see, e.g., Green et al [12] for further details.…”

Section: Particle Migration Model By Baart Et Al [11]mentioning

confidence: 99%

“…Baart et al [11] investigated the motion of contaminant particles in a grease pocket in a double restriction seal geometry developed by Green et al [12]; see Figure 1. Baart et al [11] used the analytical velocity model developed by Batchelor [13] for the flow in a wide pocket where the velocity is solely linear and one-dimensional.…”

Section: Introductionmentioning

confidence: 99%

“…Baart et al [11] used the analytical velocity model developed by Batchelor [13] for the flow in a wide pocket where the velocity is solely linear and one-dimensional. For the migration problem in a narrow pocket where the flow is heavily affected by the lateral boundaries, velocity profiles from micro Particle Image Velocimetry (µPIV) data are used to describe the velocity variation in the pocket.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Contaminant Particle Motion in Lubricating Grease Flow: A Computational Fluid Dynamics Approach

et al. 2018

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Abstract:In this paper, numerical simulations of particle migration in lubricating grease flow are presented. The rheology of three lithium greases with NLGI (National Lubricating Grease Institute) grades 00, 1 and 2 respectively are considered. The grease is modeled as a single-phase Herschel-Bulkley fluid, and the particle migration has been considered in two different grease pockets formed between two concentric cylinders where the inner cylinder is rotating and driving the flow. In the wide grease pocket, the width of the gap is much smaller compared to the axial length scale, enabling a one-dimensional flow. In the narrow pocket, the axial and radial length is of the same order, yielding a three-dimensional flow. It was found that the change in flow characteristics due to the influence of the pocket lateral boundaries when going from the wide to the narrow pocket leads to a significantly shorter migration time. Comparing the results with an existing migration model treating the radial component contribution, it was concluded that a solution to the flow in the whole domain is needed together with a higher order numerical scheme to obtain a full solution to the particle migration. This result is more pronounced in the narrow pocket due to gradients in the flow induced by the lateral boundaries.

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References

2012

Grease Lubrication in Rolling Bearings

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The Influence of Speed, Grease Type, and Temperature on Radial Contaminant Particle Migration in a Double Restriction Seal

Cited by 17 publications

References 13 publications

Grease flow in an elbow channel

Grease flow in an elbow channel

Contaminant Particle Motion in Lubricating Grease Flow: A Computational Fluid Dynamics Approach

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