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首页> 外文期刊>International Journal of Heat and Mass Transfer >Nonlocal two-temperature model: Application to heat transport in metals irradiated by ultrashort laser pulses
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Nonlocal two-temperature model: Application to heat transport in metals irradiated by ultrashort laser pulses

机译：非局部两温模型：在超短激光脉冲辐射的金属中的热传递中的应用

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摘要

Extended two-temperature models with allowance for time (relaxation) and space nonlocal effects have been developed to describe, in particular, heat conduction in metals under ultrashort laser irradiation, which overheats the electron gas in comparison with the lattice leading to energy exchange between them. The time nonlocal effects arise when the electron gas is driven out of local (thermal) equilibrium, whereas the space nonlocal effects begin to be significant when the spatial extent of the temperature gradient is comparable with the mean-free path of the heat carrier. The electron-lattice energy exchange as well as the space-time nonlocal effects in the electron gas leads to a hierarchy of space-time nonlocal heat conduction equations for the electron and lattice temperatures, which are partial differential equation of higher order in comparison with the classical heat conduction equation. The models presented here may be used in combination with molecular dynamic and phase-field approaches.
机译：已开发了具有时间（松弛）和空间非局部影响的扩展的两温度模型，以描述特别是在超短激光辐射下金属的热传导，与晶格相比，电子热与晶格相比导致电子气过热，从而导致金属间的能量交换。当电子气被驱离局部（热）平衡时，会出现时间非局部效应，而当温度梯度的空间范围与载热体的平均自由程相当时，空间非局部效应就会变得很明显。电子-晶格能量交换以及电子气中的时空非局域效应导致了电子和晶格温度的时空非局域热传导方程的层次结构，这是与电子和晶格温度相比更高阶的偏微分方程。经典的热传导方程。此处介绍的模型可以与分子动力学和相场方法结合使用。

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