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Lubricants 2016, 4(4), 37; doi:10.3390/lubricants4040037

Tribological Stress of Lubricating Greases in the Light of System Entropy

Laboratory of Machine Elements and Tribology (MuT), Institute of Engineering Design and Product Development, Hamburg University of Applied Sciences, 20099 Hamburg, Germany
Academic Editor: James E. Krzanowski
Received: 4 October 2016 / Revised: 31 October 2016 / Accepted: 10 November 2016 / Published: 17 November 2016
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Abstract

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. View Full-Text
Keywords: lubricating grease; structural degradation; entropy lubricating grease; structural degradation; entropy
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Kuhn, E. Tribological Stress of Lubricating Greases in the Light of System Entropy. Lubricants 2016, 4, 37.

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