We present a continuum hybrid phonon gas model to describe transient ballistic-diffusive 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 heat-pulse 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 ballistic-diffusive heat conduction mechanisms but also provides numerical tools to study transient ballistic-diffusive heat conduction in nanoelectronic and modern optoelectronics.
A Hybrid Phonon Gas Model for Transient Ballistic-Diffusive Heat Transport
Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received September 11, 2012; final manuscript received December 7, 2012; published online February 20, 2013. Assoc. Editor: Robert D. Tzou.
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Ma, Y. (February 20, 2013). "A Hybrid Phonon Gas Model for Transient Ballistic-Diffusive Heat Transport." ASME. J. Heat Transfer. April 2013; 135(4): 044501. https://doi.org/10.1115/1.4023231
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