The Collision, Coalescence, and Disruption of Water Droplets

Adam, John R.; Lindblad, N. R.; Hendricks, C. D.

doi:10.1063/1.1655940

Cited by 165 publications

(77 citation statements)

References 8 publications

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“…Figure 1b also shows significant droplet-droplet interactions after droplets departed from the surface, as seen by the changes in the droplet trajectories. Figure 1c-e highlights that when droplets approach one another, they tend to repel each other and do not coalesce (see Supplementary Movies 2, 3 and 4), an unexpected observation if the droplets were neutral 42 . Instead, the mid-flight repulsion indicates that droplets may carry electric charge.…”

Section: Jumping Droplet Interactionsmentioning

confidence: 99%

Electrostatic charging of jumping droplets

et al. 2013

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With the broad interest in and development of superhydrophobic surfaces for self-cleaning, condensation heat transfer enhancement and anti-icing applications, more detailed insights on droplet interactions on these surfaces have emerged. Specifically, when two droplets coalesce, they can spontaneously jump away from a superhydrophobic surface due to the release of excess surface energy. Here we show that jumping droplets gain a net positive charge that causes them to repel each other mid-flight. We used electric fields to quantify the charge on the droplets and identified the mechanism for the charge accumulation, which is associated with the formation of the electric double layer at the droplet-surface interface. The observation of droplet charge accumulation provides insight into jumping droplet physics as well as processes involving charged liquid droplets. Furthermore, this work is a starting point for more advanced approaches for enhancing jumping droplet surface performance by using external electric fields to control droplet jumping.

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Section: Jumping Droplet Interactionsmentioning

confidence: 99%

Electrostatic charging of jumping droplets

et al. 2013

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“…regime diagrams based on different physical arguments (e.g., Adam et al 1968;Park 1970;Qian and Law 1997). owing to space constraints these studies are not discussed here.…”

Section: B Previous Workmentioning

confidence: 99%

Toward a Physical Characterization of Raindrop Collision Outcome Regimes

Testik

Barros

Bliven

2011

Journal of the Atmospheric Sciences

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A comprehensive raindrop collision outcome regime diagram that delineates the physical conditions associated with the outcome regimes (i.e., bounce, coalescence, and different breakup types) of binary raindrop collisions is proposed. The proposed diagram builds on a theoretical regime diagram defined in the phase space of collision Weber numbers We and the drop diameter ratio p by including critical angle of impact considerations. In this study, the theoretical regime diagram is first evaluated against a comprehensive dataset for drop collision experiments representative of raindrop collisions in nature. Subsequently, the theoretical regime diagram is modified to explicitly describe the dominant regimes of raindrop interactions in (We, p) by delineating the physical conditions necessary for the occurrence of distinct types of collision-induced breakup (neck/filament, sheet, disk, and crown breakups) based on critical angle of impact consideration. Crown breakup is a subtype of disk breakup for lower collision kinetic energy that presents distinctive morphology. Finally, the experimental results are analyzed in the context of the comprehensive collision regime diagram, and conditional probabilities that can be used in the parameterization of breakup kernels in stochastic models of raindrop dynamics are provided.

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“…Macroscopic droplets draw a long neck which ruptures at random positions [10]. Responsible for this behaviour are surface vibrations along the neck.…”

Section: Random Neck Rupturementioning

confidence: 99%

In the exit channel of nuclear fission

Brösa

Großmann

1983

Z Physik A

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The final period of nuclear fission is discussed. We propose the following picture: Nuclear scission happens because of an hydrodynamic instability triggered by random surface vibrations. Thus the scissioning complex ruptures at random positions. Measured total kinetic energies point to the very relevance of the instability, while the randomness of rupture shows up in neutron emission data. A Principal Difficulty with Present Fission TheoriesThere are presently two models for the description of nuclear fission [1,2]. They have been impressively modified and refined. For surveys see Wilets' booklet [3] and the references in an article by Wilkins et al. [4]. Despite their partial successes, both models run into specific disagreement with measurements, and this raises suspicion that both still miss an important aspect of the fission process. The statistical model [1,4] emphasizes the scission point. The two nascent fragments are imagined as two more or less dented pots in some contact. The pots are filled with nucleons which individually feel free to jump to and fro, but adhere statistical laws controlled by the level density. Crudely spoken, we havefor the probability P that one of the fragments incorporates A nucleons. The level density parameter a is approximately A~n/8 [5], A~, being the mass number of the compound nucleus and E~, its excitation energy. The dependence on A enters the righthand side of (1) . However, when the descent from saddle to scission point was treated in a somewhat more realistic fashion [7], the calculated mass distributions shrunk to dis-

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The Collision, Coalescence, and Disruption of Water Droplets

Cited by 165 publications

References 8 publications

Electrostatic charging of jumping droplets

Electrostatic charging of jumping droplets

Toward a Physical Characterization of Raindrop Collision Outcome Regimes

In the exit channel of nuclear fission

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