Abstract
It is proposed to consider the tribounit as a non-equilibrium thermodynamic system in which entropy is produced. The corresponding equation is obtained, whose analysis shows that in order to bring the tribounit to a stationary state, in which the entropy production tends to zero, and there is a minimum of friction force and a wear rate, it is necessary to reduce the coefficient of dynamic viscosity of the lubricating medium, the speed of relative motion of tribo-surfaces, sizes of contaminant particles, etc. As a result of laboratory studies, it has been established, in particular, that the presence of contaminant particles in the oil with the average weighted size of 10.36 μm leads to a decrease in the oil temperature, the friction coefficient and wear of the tribo-surfaces compared to the oil in which the average weighted size of particles is 35.8 μm. This proves the original hypothesis of the article that the tribounit is a thermodynamic system in which entropy is produced, and to which the laws of non-equilibrium thermodynamics are applicable
Highlights
When studying the processes of the tribounit friction and wear, it is necessary to consider it as a dynamic dissipative system in which the degradation of the energy of the macro-mechanical movement is realized, i.e., entropy is produced
Note: Tables 1 and 2 show the average values for the results of five tests on the oil in each of its state. As it can be seen from the data presented, the oil temperature, the friction coefficient and wear on both friction machines with different combinations of materials of samples are less when lubricating them with the I-G-A -32 oil with the average weighted size of particles of 10.36 μm compared to the oil, in which the average weighted size of particles is 235.8 microns
The presence of contaminant particles in the oil with the average weighted size of 10.36 μm leads to a decrease in the oil temperature and friction coefficient, which is a direct indicator that the tribounit can be considered as a thermodynamic system, which under the certain conditions tends to an equilibrium state, that is, to minimizing friction and wear
Summary
When studying the processes of the tribounit friction and wear, it is necessary to consider it as a dynamic dissipative system in which the degradation of the energy of the macro-mechanical movement is realized, i.e., entropy is produced. In this regard, it is quite appropriate to use the basic law of non-equilibrium thermodynamics about the tendency to bring the entropy of a thermodynamic system to a minimum positive value when it approaches a stationary state, which is characterized by the constancy of all parameters of the system. As applied to the tribounit as an object of non-equilibrium thermodynamics, here we mean the friction force and the wear rate of tribo surfaces [1]
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