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Lubricating Grease Shear Flow and Boundary Layers in a Concentric Cylinder Configuration
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.ORCID-id: 0000-0001-5294-1855
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.ORCID-id: 0000-0003-4785-7098
SKF ERC.
Vise andre og tillknytning
2015 (engelsk)Konferansepaper, Oral presentation only (Fagfellevurdert)
Abstract [en]

Grease is extensively used to lubricate various machine elements such as rolling bearings, seals, and gears. Understanding the flow dynamics of grease is relevant for the prediction of grease distribution for optimum lubrication and for the migration of wear and contaminant particles. In this study, grease flow is visualized using micro Particle Image Velocimetry (μPIV). The experimental setup includes a concentric cylinder configuration with a rotating shaft to simulate the grease flow in a double restriction seal geometry with two different grease pocket sizes. It is shown that the grease is partially yielded in the large grease pocket geometry and fully yielded in the small grease pocket. For the small grease pocket, it is shown that three distinct grease flow layers are present: a high shear rate region close to the stationary wall, a bulk flow layer, and a high shear rate boundary region near the rotating shaft. The grease shear thinning behavior and its wall slip effects have been identified. The μPIV experimental results have been compared with a numerical model for both the large and small gap size. It is shown that the flow is close to one-dimensional in the center of the small pocket. A one-dimensional analytical model based on the Herschel-Bulkley rheology model has been developed, showing good agreement with the measured velocity profiles in the small grease pocket. Furthermore, wall slip effects and shear banding are observed, where the latter imply that using the assumption of uniform shear in conventional concentric cylinder rheometers may result in erroneous rheological results.

sted, utgiver, år, opplag, sider
2015.
HSV kategori
Forskningsprogram
Strömningslära; Maskinelement
Identifikatorer
URN: urn:nbn:se:ltu:diva-40719Lokal ID: ff4b02dd-4b8b-4e98-ba12-cb157c52ba19OAI: oai:DiVA.org:ltu-40719DiVA, id: diva2:1014240
Konferanse
STLE Annual Meeting & Exhibition : 17/05/2015 - 21/05/2015
Merknad
Godkänd; 2015; 20150602 (andbra)Tilgjengelig fra: 2016-10-03 Laget: 2016-10-03 Sist oppdatert: 2018-03-09bibliografisk kontrollert

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Li, JinxiaWesterberg, Lars-GöranHöglund, Erik

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