Viscous to Inertial Crossover in Liquid Drop Coalescence

Details Viscous to Inertial Crossover in Liquid Drop Coalescence Viscous to Inertial Crossover in Liquid Drop Coalescence

2010-12-06

arxiv.org/abs/1012.1298v4

Phys. Rev. Lett. 106, 114501 (2011)

Physics

Fluid Dynamics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.106.114501

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 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.

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