The aim of this research is to identify possible mechanisms that govern heat transport at a solid-liquid interface using molecular dynamics. The study reveals that, unlike its bulk analogue, a liquid in a nanochannel sustains long-lived collective vibrations, phonons, which propagate over longer timescales and distances. The larger phonon mean free path in nanochannels is attributed to the greater structural order of the liquid atoms and to the larger liquid relaxation time-the time in which the liquid structure remains unchanged and solid-like. For channels of height less than 10 σ , long-range phonons are the dominant means of heat transfer in the directions parallel to the channel walls. The present findings are in agreement with experiments, which have observed significantly increased liquid relaxation times for the same range of channel heights. Finally, it is argued that confinement introduces additional transverse modes of vibration that also contribute to the thermal conductivity enhancement.

中文翻译：

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密闭液体中的固体状传热。

这项研究的目的是利用分子动力学来确定控制固液界面传热的可能机制。这项研究表明，与其大量类似物不同，纳米通道中的液体会维持长期存在的集体振动声子，声子会在更长的时间范围和距离内传播。纳米通道中较大的声子平均自由程归因于液体原子的较大结构顺序和较大的液体弛豫时间（其中液体结构保持不变且呈固体状的时间）。对于高度小于10σ的通道，在与通道壁平行的方向上，长距离声子是传热的主要手段。目前的发现与实验相符，在相同的通道高度范围内，观察到的液体弛豫时间显着增加。最后，有人认为限制会引入额外的横向振动模式，这也有助于提高导热系数。