A Hybrid Phonon Gas Model for Transient Ballistic Diffusive Heat Transport

Abstract

We present a continuum hybrid phonon gas model to describe transient ballisticdiffusive heat transport. In this model, heat energy is carried by a mixture of longitudinal and transverse phonon gases so that the distinction between longitudinal and transverse phonon excitations is taken into account. This new model is validated by the successful reconstruction of benchmark cases of heatpulse experiments in NaF, which have never been completely reconstructed before. It is elucidated how thermal pulses are transmitted by longitudinal and transverse phonon gases. This model not only helps us yield new insight in transient ballisticdiffusive heat conduction mechanisms but also provides numerical tools to study transient ballisticdiffusive heat conduction in nanoelectronic and modern optoelectronics.