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A molecular dynamics and finite elements study of nanoscale thermal contact conductance

机译:纳米级热接触电导的分子动力学和有限元研究

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We study scale effects on the conductivity of crystalline contacting interfaces. The approach focuses on the role played by lattice vibrations in the thermal conductivity using finite elements and molecular dynamics models. A special effort is made at calibrating the continuum model directly from molecular dynamics simulations. An innovative method that uses the temperature evolution issued from an impulse boundary condition is employed to compute heat conductivity, which is notoriously known as difficult to measure. Using this approach, a parametric study is conducted on a set of contacting surfaces on which we specify asperities wavelengths. It is shown that the usual power laws that relate contact area ratio with thermal conductivity do not apply at the nanoscale.
机译:我们研究晶体接触界面的电导率的尺度效应。该方法使用有限元和分子动力学模型,着重研究晶格振动在热导率中的作用。直接从分子动力学模拟中校准连续谱模型需要付出特殊的努力。一种采用从脉冲边界条件产生的温度变化的创新方法来计算导热系数,众所周知,导热系数难以测量。使用这种方法,在一组我们指定粗糙波长的接触表面上进行了参数研究。结果表明,将接触面积比与热导率相关的常规功率定律不适用于纳米级。

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