The Rudolf Peierls Centre for Theoretical Physics , 1 Keble Road, Oxford OX1 3NP, United Kingdom.
Key Laboratory for Precision & Nontraditional Machining Technology of Ministry of Education, Dalian University of Technology , Dalian 116024, China.
Langmuir. 2017 Aug 1;33(30):7583-7587. doi: 10.1021/acs.langmuir.7b01625. Epub 2017 Jul 21.
Reducing the contact time between bouncing droplets and an underlying solid surface is relevant to a broad range of industrial applications, such as anti-icing and self-cleaning. Previous work has found that placing cylindrical obstacles on the substrate leads to a reduction in contact time. For obstacles large compared to the drop, this is a result of hydrodynamic coupling between the azimuthal and axial spreading directions. For obstacles small compared to the drop, the reduction in contact time is interpreted as being due to fast retraction along the cylindrical ridge, followed by drop breakup. Here we use simulations to discuss in greater detail the effect of varying the obstacle size on the dynamics of the drop bouncing. We investigate the crossover between the two regimes and explain why the contact time is minimized when the radii of the drop and the cylindrical obstacle are comparable.
减少弹滴与基底固体表面之间的接触时间与广泛的工业应用相关，例如防冰和自清洁。以前的工作发现，在基底上放置圆柱形障碍物会导致接触时间减少。对于与液滴相比较大的障碍物，这是由于轴向和周向扩展方向之间的流体动力耦合所致。对于与液滴相比较小的障碍物，接触时间的减少可解释为沿圆柱形脊快速缩回，随后液滴破裂。在这里，我们使用模拟来更详细地讨论障碍物尺寸对液滴弹跳动力学的影响。我们研究了两种状态之间的转变，并解释了为什么当液滴和圆柱形障碍物的半径相当时接触时间最小。
