Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session R03: Drops: Coalescence I
1:50 PM–3:34 PM,
Monday, November 20, 2023
Room: Ballroom C
Chair: Samaneh Farokhirad, New Jersey Institute of Technology
Abstract: R03.00004 : Coalescence of vibrated droplets.
2:29 PM–2:42 PM
Presenter:
Céline Cohen
(Université Côte d'Azur, Institut de Physique de Nice)
Authors:
Céline Cohen
(Université Côte d'Azur, Institut de Physique de Nice)
LORENZO BETTI
(Université Côte d'Azur, Institut de Physique de Nice)
XAVIER NOBLIN
(Université Côte d'Azur, Institut de Physique de Nice)
We have recently demonstrated the benefits of substrate vibration in generating multiple coalescences of the collection of droplets that forms a condensation pattern. By impacting a solid bead on the back of a fogged surface, we have shown that the number of droplets can be greatly reduced. We have shown that efficiency (drop number reduction %DNR) begins to increase with average drop size, starting from a minimum drop size. This threshold size decreases with increasing acceleration. Moreover, for a given size, efficiency increases with acceleration. By defining an effective Bond number β∗, calculated with maximum substrate acceleration in place of gravity, we have demonstrated the universal nature of this phenomenon. Indeed, the different curves of %DNR as a function of this effective Bond number then fall onto a master curve. Hence, we show that the impact accelerates the natural aging of the breath figure. This could provide a new solution to increase the efficiency of dew recovery processes.
I will then present new experiments on the coalescence dynamics between two sessile water droplets submitted to vertical vibrations. We show that the coalescence can be instantaneous, delayed or totally avoided. We measure the neck growth dynamics as function of drops approach speed and substrate wetting properties.
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