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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 0.7

ISSN Imprimir: 1940-2503
ISSN En Línea: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2014005894
pages 47-57

THERMOHYDRODYNAMIC ANALYSIS OF A JOURNAL BEARING WITH A MICROGROOVE ON THE SHAFT

Samuel Cupillard
Hydro-Quebec Research Institute, Varennes, QC, Canada
Michel J. Cervantes
Lulea University of Technology, Division of Fluid Mechanics, Lulea SE-971 87, Sweden; Water Power Laboratory, Norwegian University of Science and Technology, Trondheim, Norway
S. Glavatskih
Machine Design, KTH Royal Institute of Technology, 10044 Stockholm, Sweden Department of Mechanical Construction and Production, Ghent University, B-9000 Ghent, Belgium

SINOPSIS

In this study, thermohydrodynamic performance of a journal bearing with a microgroove created on the shaft is analyzed. A plain journal bearing is modeled using a computational fluid dynamics (CFD) software package. Navier-Stokes and energy equations are solved. The rotor-stator interaction is treated by using a computational grid deformation technique. The goal is to examine the pressure/temperature distribution in the bearing film. Results are presented in terms of typical bearing parameters as well as flow patterns. Results are also compared to the bearing with a smooth shaft. The effect induced by a microgroove on pressure distribution is explained for different bearing configurations, eccentricities, and microgroove depths. It is shown that the microgroove produces a local drop in pressure which, averaged over one revolution, decreases the load carrying capacity. The load carrying capacity is further decreased by using deeper microgrooves. With thermal effects considered, the microgroove carries more cold lubricant into the warmest regions of the bearing. This effect, more pronounced with deeper microgrooves, is due to a global flow recirculation inside the microgroove, which improves mixing.


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