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Droplet moonwalking
Engineering with Computers ( IF 8.7 ) Pub Date : 2021-06-19 , DOI: 10.1007/s00366-021-01434-3
Alastair J. Radcliffe

The accelerations of sessile, viscous ferrofluid droplets across a flat, smooth hydrophobic substrate, due to surface deformations induced by a perpendicularly rotating magnetic field, are investigated with coupled finite element/boundary element computer simulations. For moderate field strengths, monotonically increasing relationships are found between acceleration and both magnetic field strength and inverse viscosity, with maxima at a rotation frequency approximately one-third that of the natural harmonic of the droplet. At higher field strengths a variety of more extreme droplet rolling, bounding and jumping behaviour in the opposite travel direction is observed for the same range of rotation speeds.



中文翻译:

飞沫月球漫步

由于垂直旋转磁场引起的表面变形,固定的粘性铁磁流体液滴在平坦、光滑的疏水基底上的加速度通过耦合有限元/边界元计算机模拟进行研究。对于中等场强,在加速度与磁场强度和逆粘度之间发现单调增加的关系,最大值在旋转频率约为液滴自然谐波的三分之一处。在更高的场强下,对于相同的旋转速度范围,观察到在相反的行进方向上的各种更极端的液滴滚动、跳跃和跳跃行为。

更新日期:2021-06-19
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