In the nanoscale regime, flow behaviors for liquids show qualitative deviations from bulk expectations. In this work, we reveal by molecular dynamics simulations that plug flow down to nanoscale induces molecular friction that leads to a new flow structure due to the molecular clogging of the encaged liquid. This plug-like nanoscale liquid flow shows several features differ from the macroscopic plug flow and Poiseuille flow: It leads to enhanced liquid/solid friction, producing a friction of several order of magnitude larger than that of Couette flow; the friction enhancement is sensitively dependent of the liquid column length and the wettability of the solid substrates; it leads to the local compaction of liquid molecules that may induce solidification phenomenon for a long liquid column.

Graphical abstract

中文翻译：

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通过限制液体流动堵塞来最大化摩擦

在纳米尺度范围内，液体的流动行为显示出与体积预期的定性偏差。在这项工作中，我们通过分子动力学模拟揭示了向下到纳米级的活塞流会引起分子摩擦，从而由于封闭液体的分子堵塞而导致新的流动结​​构。这种栓塞状纳米级液体流动显示出与宏观活塞流动和泊肃叶流动不同的几个特征：它导致液体/固体摩擦增强，产生比库埃特流动大几个数量级的摩擦；摩擦增强敏感地取决于液柱长度和固体基材的润湿性；它导致液体分子的局部压实，可能导致长液柱的凝固现象。

图形概要