Open AccessНeat and mass transfer models at boundary lubrication to determine the transition temperatures
Author(s) -
O. Dykha,
A. Staryi,
AUTHOR_ID
Publication year - 2021
Publication title -
problemi tribologìï
Language(s) - English
Resource type - Journals
ISSN - 2079-1372
DOI - 10.31891/2079-1372-2021-102-4-42-50
Subject(s) - lubrication , materials science , thermodynamics , lubricant , heat transfer , mass transfer , mechanics , nonlinear system , boundary (topology) , boundary value problem , composite material , physics , mathematics , quantum mechanics , mathematical analysis
At present, kinetic and thermodynamic methods for assessing the lubricating effect of oils are being increasingly developed. At the limit friction, the reduction of friction and wear of surfaces is due to the ability of the lubricant to form layers of adsorption or chemical origin on the surface. Analytical models of transition temperatures and wear in the limit lubrication mode must be used to mathematically describe the processes in the subsystems and the transition between them. The Fourier equation of thermal conductivity is accepted as the basic calculated dependence. It is assumed that the process of heat propagation under the conditions of formation of lubricating films is not Markovian, i.e. the magnitude of the heat flux is determined by the entire "history" of heat transfer in a certain elementary volume. The equation of motion of a lubricating film over the surface of a body that is being lubricated is obtained from the equation of motion for a Newtonian continuous medium. As a result, nonlinear heat and mass transfer models are obtained to determine the transition temperatures in the formation of boundary lubricating films in the concept of structural-thermodynamic approaches to describe the processes of boundary lubrication of surfaces