论文标题
风的影响对流下线的粘性液体膜
Influence of wind on a viscous liquid film flowing down a thread
论文作者
论文摘要
我们通过实验研究风的影响对流下螺纹的粘性液体膜的动力学作用。液体膜是众所周知的，可以使轴对称珠状样式在停滞的空气中不稳定。当流动的膜暴露于侧面时，将珠子推向下游，打破对称性，从而改变膜流动。液体膜中的粘性耗散随着侧面的增加而减小，从而导致液体珠的幻灯片速度更快。然后增加了电影中的惯性，这会引起政权的转移，从而触发不稳定。当膜变得不稳定时，它会从同等大小的液体珠的周期性模式转换为不规则的膜图案，其中大珠与较小的珠子相撞。
We investigate experimentally the effect of wind on the dynamics of a viscous liquid film flowing down a thread. The liquid film is well-known to destabilize into an axisymmetric bead-like pattern in stagnant air. When the flowing film is exposed to side-wind, the beads are pushed downstream breaking the symmetry leading to a modification of the film flow. The viscous dissipation in the liquid film decreases with increasing side-wind, leading to a faster slide speed of the liquid beads. The inertia in the film is then increased, which can induce a regime shift, triggering an instability. When the film becomes unstable, it switches from a periodic pattern of equally sized liquid beads to an irregular film pattern where large beads collide with smaller ones.
