ANALYSIS OF SHORT-TIME HEAT-CONDUCTION IN SOLIDS BY EXTENDED IRREVERSIBLE THERMODYNAMICS AND MOLECULAR-DYNAMICS

Instantaneous heat propagation and thermodynamic local equilibrium can not be assumed when solving space and time microscale problems. Theref ore, we reconsider the thermodynamics basis of the Fourier law-in orde r to obtain the new heat conduction models: the hyperbolic heat equati on (EH) and the modified hyperbolic equation (EHM). We have performed molecular dynamics (DM) experiments which are independent of any therm odynamic model, to test the macroscopic approaches. We show that the s olutions of the EH and the EHM do not agree with the numerical experim ents and that the MD results are strongly dependent on the way from wh ich the macroscopic conditions are simulated in the microscopic point of view.