ANALYSIS OF HYDRODYNAMIC LUBRICATION OF JOURNAL BEARINGS WITH OIL OF NON-NEWTONIAN PROPERTIES
Journal Title: Tribologia - Year 2017, Vol 272, Issue 2
Abstract
In this paper, the presented issue concerns hydrodynamic lubrication of the journal bearings with the oil of non-Newtonian properties. For the analysis of the hydrodynamic lubrication, a constitutive model of the third order was assumed. The assumed model consist of a Newtonian part –pI+ηA1 and non-Newtonian part β3·tr(A1 2)A1. The main part of this paper concerns transformation, nondimensionalization, and an estimation of the order of magnitude of the equation, which describes the apparent viscosity. Apparent viscosity describes changes in the dynamic viscosity with shear rate. In this way, the prepared model of apparent viscosity is used in momentum equations. These equations are integrated in order to designate components of the velocity vector. By substitution of the proper boundary conditions, a modified Reynolds type equation is obtained. A further stage of the research will be proceeding of the numerical calculations of the hydrodynamic pressure distribution followed by the designation of the carrying capacity, friction force, and friction coefficient while taking changes of the viscosity from shear rate into account (apparent viscosity).
Authors and Affiliations
Andrzej MISZCZAK, Grzegorz SIKORA
Keywords
Related Articles
- EP ID EP239714
- DOI -
- Views 66
- Downloads 0
IDENTIFICATION OF CONTACT FORCE AND OF ELASTIC PARAMETERS IN THE ZONE OF FRICTIONAL CONTACT OF THE SHAFT WITH A LIP SEALING RING
An analytical and model approach for the determination of main parameters defining the moment of friction generated in the zone contact of an elastomeric sealing ring with a shaft with a complex covering layer. The appro...
Wpływ wybranych napełniaczy na właściwości ciernych materiałów hamulcowych
Polimery kationowe jako efektywne dodatki do substancji smarowych na bazie wody
Głównie ze względu na aspekty ekologiczne prowadzone są badania nad zastosowaniem wody jako bazy substancji smarowych. Trwają próby poprawy jej niekorzystnych właściwości tribologicznych i fizykochemicznych (np. działani...
THE INFLUENCE OF THE TIME OF TECHNOLOGICAL SOAKING OF NITRIDED EN-X37CrMoV5-1 TOOL STEEL AT A HIGHER TEMPERATURE ON THE STRUCTURE, MICROHARDNESS, AND TRIBOLOGICAL WEAR OF THE SURFACE LAYER
The paper concerns the assessment of the influence of the duration of high-temperature soaking of steel intended for dies for extruding aluminium profiles on the structure, microhardness, and tribological wear of the top...
THE INFLUENCE OF TEMPERATURE ON COEFFICIENT OF MAGNETIC SUSCEPTIBILITY χ OF FERRO-OILS WITH DIFFERENT CONCENTRATIONS OF MAGNETIC PARTICLES
In this paper, the authors presented research concerning the determination of the relation between magnetic susceptibility coefficient χ of ferro-oil and temperature changes. The tests were conducted on the ferro-oil sam...