Abstract
We derive two different generalized heat-transport equations: the most general one, of the first order in time and second order in space, encompasses some well-known heat equations and describes the hyperbolic regime in the absence of nonlocal effects. Another, less general, of the second order in time and fourth order in space, is able to describe hyperbolic heat conduction also in the presence of nonlocal effects. We investigate the thermodynamic compatibility of both models by applying some generalizations of the classical Liu and Coleman–Noll procedures. In both cases, constitutive equations for the entropy and for the entropy flux are obtained. For the second model, we consider a heat-transport equation which includes nonlocal terms and study the resulting set of balance laws, proving that the corresponding thermal perturbations propagate with finite speed.
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Communicated by Attila R. Imre.
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Rogolino, P., Kovács, R., Ván, P. et al. Generalized heat-transport equations: parabolic and hyperbolic models. Continuum Mech. Thermodyn. 30, 1245–1258 (2018). https://doi.org/10.1007/s00161-018-0643-9
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DOI: https://doi.org/10.1007/s00161-018-0643-9