Phonon vortex dynamics in graphene ribbon by solving Boltzmann transport equation with ab initio scattering rates
Phonon vortex dynamics in graphene ribbon by solving Boltzmann transport equation with ab initio scattering rates
复制标题
通过求解具有从头散射率的玻尔兹曼输运方程来研究石墨烯带中的声子涡旋动力学
DOI：
10.1016/j.ijheatmasstransfer.2021.120981
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
and M. Wang
中科院分区：
文献类型：
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作者：
Y. Guo;Z. Zhang;M. Nomura;S. Volz;and M. Wang
本文在Callaway双弛豫模型下，通过声子Boltzmann方程的离散坐标解，研究了石墨烯带中的热声子涡旋。在不需要任何经验输入参数的情况下，通过从头计算得到了正常过程和电阻过程的声子散射率。研究了温度、尺寸和同位素效应对简单和复杂几何结构中声子涡旋输运到传统傅里叶热传导转变的影响。通过电阻过程的宽声子平均自由程分布揭示了声子涡旋演化的物理机制。在复杂的几何形状下，得到了一个包含初级涡、次级涡和三级涡的分级涡系。目前的工作提供了一个准确和有效的多尺度数值框架，模拟流体动力学声子输运在高导热材料，也揭示了散热应用。
In this work, we study thermal phonon vortex in graphene ribbon by a discrete-ordinate solution of phonon Boltzmann equation under Callaway's dual relaxation model. The phonon scattering rates of normal and resistive processes are acquired fromab initiocalculation without need of any empirical input parameters. The temperature, size and isotope effects on transition from phonon vortex transport to conventional Fourier's heat conduction in both simple and complex geometries are investigated. The physical mechanism for the evolution of phonon vortex is declared by wide phonon mean free path distribution of resistive processes. A hierarchical vortex series is obtained with primary, secondary and terniary vortexes in a complicated geometry. The present work provides an accurate and efficient multi-scale numerical framework for modeling hydrodynamic phonon transport in high-thermal-conductivity materials and also sheds light on the heat dissipation applications.