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Negative thermal conductivity of chains of rotors with mechanical forcing

Stoltz, Gabriel; Iacobucci, Alessandra; Legoll, Frédéric; Olla, Stefano (2011), Negative thermal conductivity of chains of rotors with mechanical forcing, Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, 84, 6, p. Paper 061108. http://dx.doi.org/10.1103/PhysRevE.84.061108

Type
Article accepté pour publication ou publié
External document link
http://hal.archives-ouvertes.fr/hal-00608036/fr/
Date
2011
Journal name
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Volume
84
Number
6
Publisher
American Physical Society
Pages
Paper 061108
Publication identifier
Metadata
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Author(s)
Stoltz, Gabriel
Centre d'Enseignement et de Recherche en Mathématiques et Calcul Scientifique [CERMICS]
Iacobucci, Alessandra cc
CEntre de REcherches en MAthématiques de la DEcision [CEREMADE]
Legoll, Frédéric

Olla, Stefano cc
CEntre de REcherches en MAthématiques de la DEcision [CEREMADE]
Abstract (EN)
We consider chains of rotors subjected to both thermal and mechanical forcings,in a nonequilibrium steady-state. Unusual nonlinear profiles of temperature and velocities are observed in the system. In particular, the temperature is maximal in the center, which is an indication of the nonlocal behavior of the system. In spite of that, local equilibrium holds for long enough chains. Our numerical results also show that, when the mechanical forcing is strong enough, the energy current can be increased by an inverse temperature gradient. This counterintuitive result again reveals the complexity of nonequilibrium states.
Subjects / Keywords
Thermal conductivity; non-equilibrium stationary states