The effects of gravity on the capillary instability in tubes
The effects of gravity on the capillary instability in tubes
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DOI：
10.1017/s0022112006009505
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发表时间：
2006-05
影响因子：
3.7
通讯作者：
V. Duclaux;C. Clanet;D. Quéré
中科院分区：
文献类型：
--
作者：
V. Duclaux;C. Clanet;D. Quéré
本文研究了水平圆柱管（半径为R_0 $）表面液膜（厚度为h_0 $）的毛细不稳定性。实验表明，只有当h_0/R_0>0.3（R_0/a）^2$时，才发生不稳定性，其中a$为毛细管长度。如果不满足该标准，则由于重力排水，液体膜不会不稳定成液滴阵列。
We study the capillary instability of a liquid film (thickness $h_0$) coating a horizontal cylindrical tube (radius $R_0$). We show experimentally that the instability only occurs if $h_0/R_0>0.3(R_0/a)^2$, where $a$ is the capillary length. If this criterion is not fulfilled, the liquid film does not destabilize into an array of drops, owing to the gravitational drainage.