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A CFD study of a finite textured journal bearing
Luleå University of Technology, Division of Machine Elements.
2008 (English)In: Hydro technology and the evironment for the new century: 24th IAHR Symposium on Hydraulic Machinery and Systems, 2008Conference paper (Refereed)
Abstract [en]

An analysis of a lubricated journal bearing is performed with special attention to the influence of textured surfaces which may improve hydrodynamic performance. The bearing is subjected to an external applied load and the force balance is fulfilled with the force of the flow acting on the bearing. The position of the shaft is fixed whereas the bearing, centred at the starting time, moves under the forces until equilibrium is reached. A mesh deformation technique is used with CFD (Computational Fluid Dynamics) in order to perform the simulations. The flow is laminar, isothermal, three-dimensional (3D) and unsteady. Cavitation is taken into account. Results are analysed with smooth and textured surfaces on the bearing. Friction force and eccentricity ratio are compared for different configurations. It is found that shallow grooves under light loading (ε < 0.15) enhance the minimum film thickness while reducing the friction force. Under high loading (ε > 0.5), deep grooves are able to reduce the friction forcedespite a reduced minimum film thickness. For the second case, the predicted performance is superior to those of a smooth journal bearing with thinner lubricant.

Place, publisher, year, edition, pages
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Fluid Mechanics and Acoustics Tribology
URN: urn:nbn:se:kth:diva-80643ISBN: 978-85-60858-13-1OAI: diva2:496618
Symposium on Hydraulic Machinery and Systems, IAHR 24. Foz do Iguassu, Brazil. October 27 - 31 2008
QC 20120510Available from: 2012-02-10 Created: 2012-02-10 Last updated: 2012-05-10Bibliographically approved

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Glavatskih, Sergei
Fluid Mechanics and AcousticsTribology

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