标题： 有效导热系数的降低通过准弹道热流的循环 显示英文标题

标题： Reduction of the effective thermal conductivity by circulation of the quasi-ballistic heat-flux

摘要： 对于热导率在空间上均匀且与温度无关的情况，傅里叶热传导定律预测热流是无旋的。在准弹道声子传输区域，傅里叶定律失效，在此区域中，从玻尔兹曼输运方程出发已经证明，热流的本构关系包含一个散度为零但旋度不为零的环形项。在本文中，我们展示了如何通过利用本构关系中的环形项，来降低尺寸与声子平均自由程在同一量级的材料的有效热导率。 显示英文摘要

摘要： For a thermal conductivity that is spatially uniform and independent of temperature, Fourier's law of heat transfer predicts a curl-free heat-flux. In the quasi-ballistic phonon transport regime, where the Fourier law breaks down, it has been proven starting from the Boltzmann transport equation that the constitutive relation for the heat-flux contains a solenoidal (circulatory) term with zero divergence and non-zero curl. In this paper we show how to reduce the effective thermal conductivity of a material with dimensions on the same scale as the phonon mean-free path, by exploiting the solenoidal term in the constitutive relation.