The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.
Phys Rev Lett. 2011 Mar 18;106(11):114501. doi: 10.1103/PhysRevLett.106.114501. Epub 2011 Mar 14.
Using an electrical method and high-speed imaging, we probe drop coalescence down to 10 ns after the drops touch. By varying the liquid viscosity over two decades, we conclude that, at a sufficiently low approach velocity where deformation is not present, the drops coalesce with an unexpectedly late crossover time between a regime dominated by viscous and one dominated by inertial effects. We argue that the late crossover, not accounted for in the theory, can be explained by an appropriate choice of length scales present in the flow geometry.
我们采用电学方法和高速成像技术，探测到液滴接触后 10 纳秒内的聚并过程。通过在两个数量级范围内改变液体粘度，我们得出结论：在足够低的接近速度下（此时不存在变形），液滴在以粘性效应为主导的区域和以惯性效应为主导的区域之间的过渡时间出乎意料地延迟。我们认为，这种延迟的过渡，在现有理论中并未得到解释，可以通过对流动几何中存在的适当长度尺度的选择来解释。
