论文标题
Kelvin-Voigt模型底物上的棒滑接触线运动
Stick-Slip Contact Line Motion on Kelvin-Voigt Model Substrates
论文作者
论文摘要
液体接触线的毛细血管牵引力导致柔软的固体中高度局部变形，从而通过粘弹性制动大大减慢了润湿和脱水动力学。尽管如此，强大的速度仍导致所谓的棍棒滑移不稳定性，在此期间，接触线会定期从其自身的润湿山脊上划分。这种周期性运动的机制，尤其是动力学在流体中的作用仍然难以捉摸，部分原因是到目前为止对不稳定的软润湿问题的理论描述尚无。在这里，我们介绍了完整的不稳定软润湿问题的第一个数值模拟，并在液体和固体动力学之间达成完整的耦合。我们观察到三个软润湿动力学的三个方案：稳定的粘弹性制动，以缓慢的速度，板滑运动以中间速度进行，然后是粘弹性制动区域，在该区域中，液体阻尼抑制了棒状滑滑，最终使经典的湿润动力学让位，由液体散发占主导地位。
The capillary traction of a liquid contact line causes highly localized deformations in soft solids, tremendously slowing down wetting and dewetting dynamics by viscoelastic braking. Enforcing nonetheless large velocities leads to the so-called stick-slip instability, during which the contact line periodically depins from its own wetting ridge. The mechanism of this periodic motion and, especially, the role of the dynamics in the fluid have remained elusive, partly because a theoretical description of the unsteady soft wetting problem is not available so far. Here we present the first numerical simulations of the full unsteady soft wetting problem, with a full coupling between the liquid and the solid dynamics. We observe three regimes of soft wetting dynamics: steady viscoelastic braking at slow speeds, stick-slip motion at intermediate speeds, followed by a region of viscoelastic braking where stick-slip is suppressed by liquid damping, which ultimately gives way to classical wetting dynamics, dominated by liquid dissipation.
