Droplets sliding on fibres
Droplets sliding on fibres
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DOI：
10.1140/epje/i2010-10563-9
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发表时间：
2010-03-01
影响因子：
1.8
通讯作者：
Vandewalle, N.
中科院分区：
文献类型：
--
作者：
Gilet, T.;Terwagne, D.;Vandewalle, N.
我们提出的结果相结合的实验和理论研究的油滴在纤维上滑动。首先，轴对称形状和垂直纤维上的液滴的运动进行了描述。该运动是由于液滴重量和粘性应力之间的平衡。在长期范围内，液滴通过涂覆纤维而损失一些质量，这降低了其速度。在第二次，我们合理化的液滴，遇到垂直和水平纤维之间的交界处的行为。根据其大小，液滴可能会穿过接合处或保持堵塞。过渡是很好地描述了一个常微分方程相当于一个阻尼谐振子截断附近的水平纤维。这个简单的系统是更复杂的纤维网络的基本元件，这些纤维网络在涉及液滴的微流体应用中是有用的。
We present the results of a combined experimental and theoretical investigation of oil droplets sliding on fibres. First, both the axisymmetric shape and the motion of a droplet on a vertical fibre are described. The motion is shown to result from a balance between the droplet weight and the viscous stresses. On a long-term range, the droplet loses some mass through coating the fibre, which decreases its velocity. In a second time, we rationalize the behaviour of a droplet that encounters a junction between vertical and horizontal fibres. Depending on its size, the droplet may cross the junction or remain blocked. The transition is well described by an ordinary differential equation equivalent to a damped harmonic oscillator truncated to the neighbourhood of the horizontal fibre. This simple system is the basic element for more complex fiber networks that would be useful in microfluidic applications involving droplets.