Recirculation Flow and Pressure Distributions in a Rayleigh Step Bearing

Autor: Feng Shen, Cheng-Jin Yan, Jian-Feng Dai, Zhao-Miao Liu
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Advances in Tribology, Vol 2018 (2018)
Druh dokumentu: article
ISSN: 1687-5915
1687-5923
DOI: 10.1155/2018/9480636
Popis: Flow characteristics in the Rayleigh step slider bearing with infinite width have been studied using both analytical and numerical methods. The conservation equations of mass and momentum were solved utilizing a finite volume approach and the whole flow field was simulated. More detailed information about the flow patterns and pressure distributions neglected by the Reynolds lubrication equation has been obtained, such as jumping phenomenon around a Rayleigh step, vortex structure, and shear stress distribution. The pressure distribution of the Rayleigh step bearing with optimum geometry has been numerically simulated and the results obtained agreed with the analytical solution of the classical Reynolds lubrication equation. The simulation results show that the maximum pressure of the flow field is at the step tip not on the lower surface and the increment of the strain rate from Navier-Stokes equation is approximately 49 percent greater than that from Reynolds theory at the step tip. It is also shown that the position of the maximum pressure of the lower surface is a little less than the length of the first region. These results neglected by the Reynolds lubrication equation are important for designing a bearing.
Databáze: Directory of Open Access Journals
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