Free-surface grease flow: influence of surface roughness and temperature

Westerberg, Lars-GöranLuleå tekniska universitet,Strömningslära och experimentell mekanik (author)

Validerad; 2015; Nivå 2; 20150414 (lgwe)This article is part of the Topical Collection on STLE Tribology Frontiers Conference 2014
Grease flow in grease lubricated systems can often be qualified as free-surface flow. It occurs for example in rolling bearings after the churning phase or on open gears. Here only a fraction of the bearing or gearbox volume is filled with grease. Part of the grease is flowing in relatively thin layers induced by centrifugal forces caused by rotation of the various components. In this paper a model problem is investigated in the form of a free-surface flow of grease on a rotating disc. Experiments have been performed where the onset of flow and remaining grease have been studied varying the surface roughness, temperature and the centrifugal forces. The experiments have been coupled to analytical models describing the flow and temperature distribution in the grease. It was found that the impact of surface roughness could be neglected. The flow is determined by the centrifugal forces and rheology of the grease. Temperature effects the rheology but also the oil separation creating low shear strength/low viscosity layers at the surface.

Höglund, ErikLuleå tekniska universitet,Maskinelement(Swepub:ltu)erho (author)
Lugt, Piet M.SKF Engineering & Research Centre, P.O. Box 2350, 3430 DT, Nieuwegein, The Netherlands(Swepub:ltu)pielug (author)
Li, JinxiaLuleå tekniska universitet,Maskinelement(Swepub:ltu)jinlit (author)
Baart, PieterSKF Engineering & Research Centre, P.O. Box 2350, 3430 DT, Nieuwegein, The Netherlands(Swepub:ltu)piebaa (author)
Luleå tekniska universitetStrömningslära och experimentell mekanik (creator_code:org_t)

In:Tribology letters: Springer Science and Business Media LLC59, s. 18-1023-88831573-2711

By the author/editor: Westerberg, Lars ...; Höglund, Erik; Lugt, Piet M.; Li, Jinxia; Baart, Pieter

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Fluid Mechanics ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Tribology

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