超疏水性自发破坏的动力学
Dynamics of the spontaneous breakdown of superhydrophobicity
摘要:
沉积在粗糙和疏水表面上的液滴可以保持悬浮,液体下方有气泡,然后显示出非常低的流体动力学阻力。当这种超疏水状态被破坏时,随后的润湿过程可以显示出不同的动力学性质。几何形状的适当选择可以使润湿前沿以逐步的方式传播,导致{ \it方形}润湿区域:前沿传播缓慢,并且图案化表面通过{ \it拉链}机构逐行填充。这个润湿过程的多个时间尺度的情况下,实验特征和数值模拟相比。
英文摘要:
Drops deposited on rough and hydrophobic surfaces can stay suspended with gas pockets underneath the liquid, then showing very low hydrodynamic resistance. When this superhydrophobic state breaks down, the subsequent wetting process can show different dynamical properties. A suitable choice of the geometry can make the wetting front propagate in a stepwise manner leading to {\it square-shaped} wetted area: the front propagation is slow and the patterned surface fills by rows through a {\it zipping} mechanism. The multiple time scale scenario of this wetting process is experimentally characterized and compared to numerical simulations.
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