Under consideration for publication in J. Fluid Mech. 1 Relaxation of a dewetting contact line
Under consideration for publication in J. Fluid Mech. 1 Relaxation of a dewetting contact line
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DOI：
10.1017/s0022112008000979
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发表时间：
2007-05
影响因子：
3.7
通讯作者：
中科院分区：
文献类型：
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在浸涂实验中，通过控制弯月面的扰动，对后退接触线的动力学进行了实验研究。我们首先描述了固定的dupci和他们的崩溃在涂层过渡。在液体沉积的这个过渡之上，发现界面的动力学可以被解释为准稳态的连续。这提供了第一个实验访问的整个分岔图的动态润湿，确认流体动力学理论在第1部分。与基于动态接触角的准静态理论相比，我们证明了过渡强烈依赖于大尺度流动几何形状。然后，我们建立了大波数的色散关系，我们发现衰减率σ与波数成正比|Q|.流体动力学理论很好地描述了σ的速度依赖性，特别是在临界点不存在发散的时间尺度。最后，我们强调了一些开放的问题，接触角滞后导致超出目前的描述。
The dynamics of receding contact lines is investigated experimentally through controlled perturbations of a meniscus in a dip-coating experiment. We first describe stationary menisci and their breakdown at the coating transition. Above this transition where liquid is deposited, it is found that the dynamics of the interface can be interpreted as a quasi-steady succession of stationary states. This provides the first experimental access to the entire bifurcation diagram of dynamical wetting, confirming the hydrodynamic theory developed in Part 1. In contrast to quasi-static theories based on a dynamic contact angle, we demonstrate that the transition strongly depends on the large-scale flow geometry. We then establish the dispersion relation for large wavenumbers, for which we find a decay rate σ proportional to wavenumber |q|. The speed dependence of σ is described well by hydrodynamic theory, in particular the absence of diverging time scales at the critical point. Finally, we highlight some open problems related to contact angle hysteresis that lead beyond the current description.