Tribological Stress of Lubricating Greases in the Light of System Entropy
Lubricating greases show a structural degradation due to friction stress. The shear process dissipates energy. This results in a breakdown of the thickener structure, heat and entropy generation. Tribo-systems are energy driven systems. The stressed lubricating grease is modeled as a subsystem and p...
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Format: | Article |
Language: | English |
Published: |
MDPI AG
2016-11-01
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Series: | Lubricants |
Subjects: | |
Online Access: | http://www.mdpi.com/2075-4442/4/4/37 |
Summary: | Lubricating greases show a structural degradation due to friction stress. The shear process dissipates energy. This results in a breakdown of the thickener structure, heat and entropy generation. Tribo-systems are energy driven systems. The stressed lubricating grease is modeled as a subsystem and presents an open thermodynamic system. Investigations were made to obtain more information about the correlation of system entropy and structural degradation of a lubricating grease. Experimental studies were done to estimate the role in terms of entropy transport for the open system. The degradation-entropy theorem was applied with the help of an empirical model to describe the correlation between degradation process and entropy production for the special case of a closed and stationary system. |
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ISSN: | 2075-4442 |