Abstract Levitation of a droplet after impacting on a high-temperature wall is well known as the Leidenfrost effect. In this study, we conducted a molecular dynamics (MD) simulation to elucidate the mechanism of nanodroplet levitation and to investigate the relation between the levitation mechanism and liquid–solid intermolecular force. We found that the impacting nanodroplet levitated from its edge on the heated wall. Analyses on velocity fields inside the droplet indicated that an upward velocity at the edge of the nanodroplet was caused by an internal flow. The high wall temperature or strong liquid–solid intermolecular force caused an intensive evaporation near the three-phase contact line before levitation occurred, and this intensive evaporation yielded a large internal flow within the nanodroplet.

中文翻译：

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纳米液滴撞击受热壁的悬浮机制

摘要 液滴撞击高温壁后悬浮是众所周知的莱顿弗罗斯特效应。在这项研究中，我们进行了分子动力学（MD）模拟，以阐明纳米液滴悬浮的机制，并研究悬浮机制与液固分子间力之间的关系。我们发现撞击的纳米液滴从其边缘悬浮在加热壁上。对液滴内部速度场的分析表明，纳米液滴边缘的向上速度是由内部流动引起的。高壁温或强大的液固分子间作用力在悬浮发生之前导致三相接触线附近的强烈蒸发，这种强烈的蒸发在纳米液滴内产生了大量的内部流动。