A thermodynamic model for heat transport and thermal wave propagation in graded systems

作者：Jou D; Carlomagno I; Cimmelli V A^*

来源：Physica E: Low-Dimensional Systems and Nanostructures , 2015, 73: 242-249.

DOI：10.1016/j.physe.2015.05.026

• Graded systems
• Thermal waves
• Phase speed
• Flux of heat flux

We study the effects of a composition gradient and of a non-vanishing heat flux on the phase velocity of thermal waves along a graded system. We take into account non-local and non-linear effects by applying a generalized heat transport equation. We compare the results for high-frequency and low-frequency waves. For low frequency, we discuss the conditions in which thermal waves may propagate in SixGe1-x and (Bi1-xSbx)(2)Te-3 systems. For high frequency, we discuss the influence of the relaxation of the flux of the heat flux on the heat wave propagation.

• 出版日期2015-9