T. Kazama et al., On the effects of the temperature profile approximation in thermal Newtonian solutions of elastohydrodynamic lubrication line contacts, P I MEC E J, 215(J1), 2001, pp. 109-120
Citations number
26
Categorie Soggetti
Mechanical Engineering
Journal title
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
The assumptions of a quadratic temperature profile and mean viscosity acros
s the film, which are frequently used in the analysis of thermal elastohydr
odynamic lubrication (EHL), are examined acid discussed. Two different appr
oaches for solving the thermal EHL problem are compared for line contact co
nditions, namely (a) a one-dimensional model based upon both the assumption
of a quadratic temperature profile and the adoption of the mean physical p
roperties across the film and (b) a two-dimensional model which includes ch
anges in temperature and physical properties of a lubricant across the film
and which takes into account the conditions of reverse flow and heat conve
ction across the film occurring at the inlet region. A multi-grid algorithm
is implemented to solve these two conditions. The temperature profile and
the general solutions in the conjunction obtained in both approaches are co
mpared. For the one-dimensional model, results reveal that temperature peak
s just prior to the inlet of the conjunction. This feature is not apparent
in the two-dimensional model and results in lower values in film thickness
and larger frictional coefficients than in the two-dimensional model. In th
e high-pressure region, both equations yield almost the same mean temperatu
re.