Bouncing droplet dynamics above the Faraday threshold
Author(s)Tambasco, Lucas; Pilgram, J. J.; Bush, John W. M.
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We present the results of an experimental investigation of the dynamics of droplets bouncing on a vibrating fluid bath for forcing accelerations above the Faraday threshold. Two distinct fluid viscosity and vibrational frequency combinations (20 cS-80 Hz and 50 cS-50 Hz) are considered, and the dependence of the system behavior on drop size and vibrational acceleration is characterized. A number of new dynamical regimes are reported, including meandering, zig-zagging, erratic bouncing, coalescing, and trapped regimes. Particular attention is given to the regime in which droplets change direction erratically and exhibit a dynamics akin to Brownian motion. We demonstrate that the effective diffusivity increases with vibrational acceleration and decreases with drop size, as suggested by simple scaling arguments.
DepartmentMassachusetts Institute of Technology. Department of Mathematics
Tambasco, L. D. et al. "Bouncing droplet dynamics above the Faraday threshold." Chaos 28 (March 2018): 096107 © 2018 Author(s)
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