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Entropy 2017, 19(3), 123;

Friction, Free Axes of Rotation and Entropy

School of Physics, V. N. Karazin Kharkiv National University, Svobody Sq. 4, 61022 Kharkiv, Ukraine
Engineering Sciences Faculty, Department of Chemical Technology, Ariel University, P.O.B. 3, 407000 Ariel, Israel
Exact Sciences Faculty, Department of Physics, Ariel University, P.O.B. 3, 407000 Ariel, Israel
Author to whom correspondence should be addressed.
Academic Editor: Kevin H. Knuth
Received: 16 February 2017 / Revised: 13 March 2017 / Accepted: 14 March 2017 / Published: 17 March 2017
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Friction forces acting on rotators may promote their alignment and therefore eliminate degrees of freedom in their movement. The alignment of rotators by friction force was shown by experiments performed with different spinners, demonstrating how friction generates negentropy in a system of rotators. A gas of rigid rotators influenced by friction force is considered. The orientational negentropy generated by a friction force was estimated with the Sackur-Tetrode equation. The minimal change in total entropy of a system of rotators, corresponding to their eventual alignment, decreases with temperature. The reported effect may be of primary importance for the phase equilibrium and motion of ubiquitous colloidal and granular systems. View Full-Text
Keywords: entropy; friction; rotators; orientational negentropy; free axis of rotation entropy; friction; rotators; orientational negentropy; free axis of rotation

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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 (CC BY 4.0).

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Kazachkov, A.; Multanen, V.; Danchuk, V.; Frenkel, M.; Bormashenko, E. Friction, Free Axes of Rotation and Entropy. Entropy 2017, 19, 123.

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