Hydrodynamics of droplet coalescence
Hydrodynamics of droplet coalescence
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DOI：
10.1103/physrevlett.95.164503
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发表时间：
2005-10-14
影响因子：
8.6
通讯作者：
Bonn, D
中科院分区：
文献类型：
--
作者：
Aarts, DGAL;Lekkerkerker, HNW;Bonn, D
我们研究了具有可变粘度的分子体系和具有超低表面张力的胶体-聚合物混合物中的液滴聚结。当粘度较大或表面张力足够小时，我们观察到液桥的开启最初以毛细管速度设定的恒定速度进行。在第一个系统中，我们表明惯性效应在雷诺数约为1.5 +/- 0.5时占主导地位，然后颈部随着时间的平方根而增长。在第二个系统中，我们表明，将表面张力降低10(5)倍，为更全面地理解所涉及的流体力学开辟了道路。
We study droplet coalescence in a molecular system with a variable viscosity and a colloid-polymer mixture with an ultralow surface tension. When either the viscosity is large or the surface tension is small enough, we observe that the opening of the liquid bridge initially proceeds at a constant speed set by the capillary velocity. In the first system we show that inertial effects become dominant at a Reynolds number of about 1.5 +/- 0.5 and the neck then grows as the square root of time. In the second system we show that decreasing the surface tension by a factor of 10(5) opens the way to a more complete understanding of the hydrodynamics involved.