论文标题
对过热表面的下降影响：从毛细管优势到非线性对流优势
Drop impact on superheated surfaces: from capillary dominance to non-linear advection dominance
论文作者
论文摘要
环境空气缓冲液的影响对固体底物的影响，这种效果通常是由于气泡的夹带而揭示的，当空气被困在滴水下方的空气和液态固体接触下时被困。对于非常光滑的表面的影响，空气的存在很明显，在该表面上可以维持气体膜，从而可以在不润湿基板的情况下掉落。在这种非润湿情况下，Mandre＆Brenner（2012）在数值和理论上证明了两种物理机制可以阻止接触：表面张力和非线性对流。但是，由于液体固体接触可防止以足够大的冲击速度实现篮板，因此以对流为主的制度一直隐藏在实验中。通过对所谓的Leidenfrost Orgime Tran等人中的过热表面产生影响。 （2012年），我们可以以较高的影响速度进行下降反弹，从而使我们能够揭示该制度。使用高速总内反射，我们测量了在影响下降下的最小气体膜厚度，并提供了从表面张力到非线性惯性统治状态的过渡的证据。我们通过在存在蒸发的情况下通过耦合液体和气体动力学得出的缩放关系来合理化我们的测量。
Ambient air cushions the impact of drops on solid substrates, an effect usually revealed by the entrainment of a bubble, trapped as the air squeezed under the drop drains and liquid-solid contact occurs. The presence of air becomes evident for impacts on very smooth surfaces, where the gas film can be sustained, allowing drops to bounce without wetting the substrate. In such a non-wetting situation, Mandre & Brenner (2012) numerically and theoretically evidenced that two physical mechanisms can act to prevent contact: surface tension and non-linear advection. However, the advection dominated regime has remained hidden in experiments as liquid-solid contact prevents to realize rebounds at sufficiently large impact velocities. By performing impacts on superheated surfaces, in the so-called dynamical Leidenfrost regime Tran et al. (2012), we enable drop rebound at higher impact velocities, allowing us to reveal this regime. Using high-speed total internal reflection, we measure the minimal gas film thickness under impacting drops, and provide evidence for the transition from the surface tension to the non-linear inertia dominated regime. We rationalise our measurements through scaling relationships derived by coupling the liquid and gas dynamics, in the presence of evaporation.
