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Entropy 2010, 12(3), 480-489; doi:10.3390/e12030480

Negentropy Generation and Fractality in the Dry Friction of Polished Surfaces

1, 1, 2, 2, 2 and 2,*
1 Instituto de Física, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay 2 Department of Physics, Yeshiva University, New York, NY 10033, USA
* Author to whom correspondence should be addressed.
Received: 29 January 2010 / Revised: 24 February 2010 / Accepted: 8 March 2010 / Published: 11 March 2010
(This article belongs to the Special Issue Entropy and Friction Volume 2)
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We consider the Robin Hood model of dry friction to study entropy transfer during sliding. For the polished surface (steady state) we study the probability distribution of slips and find an exponential behavior for all the physically relevant asperity interaction-distance thresholds. In addition, we characterize the time evolution of the sample by its spatial fractal dimension and by its entropy content. Starting from an unpolished surface, the entropy decreases during the Robin Hood process, until it reaches a plateau; thereafter the system fluctuates above the critical height. This validates the notion that friction increases information in the neighborhood of the contacting surface at the expense of losing information in remote regions. We explain the practical relevance of these results for engineering surface processing such as honing.
Keywords: self-organization; entropy production; friction self-organization; entropy production; friction
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fleurquin, P.; Fort, H.; Kornbluth, M.; Sandler, R.; Segall, M.; Zypman, F. Negentropy Generation and Fractality in the Dry Friction of Polished Surfaces. Entropy 2010, 12, 480-489.

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