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Non-equilibrium molecular dynamics simulations of the thermal transport properties of Lennard-Jones fluids using configurational temperatures

机译:使用配置温度模拟Lennard-Jones流体的热传输特性的非平衡分子动力学

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摘要

We investigate the accuracy of two expressions for configurational temperature when calculating thermal transport properties in non-equilibrium systems under thermal gradients. The temperature , introduced by Jepps et al. [Phys. Rev. E. 62;2000:4757] is found to give results in almost exact agreement with the equipartition temperature for the thermal conductivity of the Lennard-Jones fluid, and for the temperature profile across a solid–liquid interface. Measurements of are, however, less precise than those of the equipartition temperature, which results in less accurate measurements of the interfacial thermal conductance across a liquid–vapour interface. The approximate expression , which depends strongly on the number of sampled atoms, predicts unphysical negative thermal conductances in liquid–vapour interfaces, highlighting the limitations of some definitions of the configurational temperature in the computation of thermal transport properties via non-equilibrium simulations.
机译:当计算非梯度系统在热梯度下的热输运性质时,我们研究了两个表达式的组态温度的准确性。温度由Jepps等人介绍。 [物理Rev. E. 62; 2000:4757]被发现与Lennard-Jones流体的热导率以及整个固液界面的温度分布的均分温度几乎完全一致。但是,的测量结果不如等分温度的测量结果精确,这导致跨液-气界面的界面热导率的测量结果不太准确。该近似表达式在很大程度上取决于采样原子的数量,它预测了液-气界面中的非物理负热导,突出了通过非平衡模拟计算热输运性质时某些构型温度定义的局限性。

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