TY - JOUR

T1 - Thermal waves in an extended hydrodynamic approach

AU - Vasconcellos, Áurea R.

AU - Luzzi, Roberto

AU - Jou, David

AU - Casas-Vazquez, José

PY - 1994/12/15

Y1 - 1994/12/15

N2 - A study of the question of heat propagation in an extended quantum hydrodynamic approach is presented. We consider a fluid of Fermi particles in interaction with a thermal bath of bosons. The equation of evolution for the flux of energy, which is incorporated as a basic thermodynamic variable thus extending the space of variables of linear thermodynamics, is derived via the nonequilibrium statistical operator method. We obtain an equation of propagation of thermal waves with damping. This hyperbolic equation, which replaces Fourier's heat law removing associated inconsistencies, depends on several thermodynamic forces that include the space variation of the flux itself. The equation allows for the propagation of damped thermal excitations that are of the type of a second sound. The dispersion relation is derived with the transport coefficients given at a microscopic (mechano-statistical)level. The limiting conditions that allow to go from the damped-wave regime of propagation to the diffusive regime are discussed. © 1994.

AB - A study of the question of heat propagation in an extended quantum hydrodynamic approach is presented. We consider a fluid of Fermi particles in interaction with a thermal bath of bosons. The equation of evolution for the flux of energy, which is incorporated as a basic thermodynamic variable thus extending the space of variables of linear thermodynamics, is derived via the nonequilibrium statistical operator method. We obtain an equation of propagation of thermal waves with damping. This hyperbolic equation, which replaces Fourier's heat law removing associated inconsistencies, depends on several thermodynamic forces that include the space variation of the flux itself. The equation allows for the propagation of damped thermal excitations that are of the type of a second sound. The dispersion relation is derived with the transport coefficients given at a microscopic (mechano-statistical)level. The limiting conditions that allow to go from the damped-wave regime of propagation to the diffusive regime are discussed. © 1994.

U2 - 10.1016/0378-4371(94)90339-5

DO - 10.1016/0378-4371(94)90339-5

M3 - Article

VL - 212

SP - 369

EP - 381

JO - Physica A: Statistical Mechanics and its Applications

JF - Physica A: Statistical Mechanics and its Applications

SN - 0378-4371

IS - 3-4

ER -