Inertia-Dominated Coalescence of Drops

Aryafar, Hamarz; Lukyanets, A. S.; Kavehpour, H. Pirouz

doi:10.1155/amrx/2006/94630

Cited by 6 publications

(10 citation statements)

References 6 publications

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“…In the examination of the inertial regime, several research efforts have found an increase of the radius of the hole following r ∼ √ t [209][210][211][212][213][214], with the mass of the retracting film accumulating in a torus-shaped rim. For Oh 1, a model was proposed where the radius of the hole follows r/R ∼ t/t v (ln(t/t v )), being R the drop radius and t v the viscous time defined as [215],…”

Section: Drop Rupture Dynamics and Retraction Speedmentioning

confidence: 99%

Single bubble and drop techniques for characterizing foams and emulsions

Suja

Rodríguez-Hakim

Tajuelo

et al. 2020

Advances in Colloid and Interface Science

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Section: Drop Rupture Dynamics and Retraction Speedmentioning

confidence: 99%

Single bubble and drop techniques for characterizing foams and emulsions

Suja

Rodríguez-Hakim

Tajuelo

et al. 2020

Advances in Colloid and Interface Science

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“…The outer fluid (air in our case, whereas oil in in Ref. 29) would be important for the bridge growth in asymmetric coalescence. Further study is required with X-ray microscopy by widely varying two curvatures between drops for different fluids.…”

mentioning

confidence: 72%

Short time dynamics of water coalescence on a flat water pool

Lim

Gim

Fezzaa

et al. 2016

Current Applied Physics

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Coalescence is an important hydrodynamic event that frequently takes place in nature as well as in industry.Here we provide an experimental study on short time dynamics of water coalescence, particularly when a water droplet comes in contact with a flat water surface, by utilizing high-resolution high-penetration ultrafast Xray microscopy. Our results demonstrate a possibility that an extreme curvature difference between a drop and a flat surface can significantly modify the hydrodynamics of water coalescence, which is unexpected in the existing theory. We suggest a plausible explanation for why coalescence can be modified by an extreme curvature difference.Coalescence between drops usually takes place to minimize the surface energy. Symmetric coalescence between equal-sized drops 1-4 has been extensively studied because of its simplicity and importance in natural and industrial situations. Early-time growth of the liquid bridge that accompanies coalescence driven by Laplace pressure has long been a central topic in fluid dynamics with the aim of understanding the relevant coalescence mechanisms. The liquid-bridge growth has been interpreted theoretically throughout integral description in Stokes flow 1 and experimentally with high-speed optical imaging 2 and electrical methods 3,4 . However, asymmetric coalescence between different-sized drops 5-8 has been poorly investigated so far, although it is essential to understand various processes such as partial coalescence 9-11 , bubble bursting 12,13 and spreading [14][15][16][17] . A few recent reports argued an impact of curvature symmetry on the hydrodynamics of water coalescence: curvature asymmetry would affect coalescence 5,6 and thus asymmetric coalescence would be different from symmetric coalescence 7,8 . More evidence is still required to confirm the effect of curvature asymmetry on coalescence hydrodynamics. Direct visualizations are essential to explain what role curvature asymmetry would play in the coalescence hydrodynamics of water. There is the experimental difficulty in revealing the initial behavior of extremely asymmetric coalescence using traditional imaging methods 13 . Notably, significant progress has been made in X-ray microscopy for direct visualization of rapid hydrodynamic behaviors 13,[18][19][20][21] . This approach enables us to investigate the short-time behavior of water coalescence particularly for a water drop on a flat water pool, which is an extreme case of curvature asymmetry.In this work, we study experimentally the effect of an extreme curvature difference on water coalescence by uti- lizing X-ray microscopy. Our results demonstrate the possibility that an extreme curvature difference between drops can play an important role in coalescence hydrodynamics. For extreme asymmetric coalescence, the contact bridge grows rapidly along the water pool surface, which makes a significant difference among extreme asymmetric coalescence, symmetric coalescence, and complete spreading of water. This finding sheds more light on the fundamental...

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“…27 Drop coalescence can be studied through two different points of view: a macroscopic analysis of the stability of the emulsions by evaluating the phase separation over a period of time 19,28 or a microscale study of a single coalescence event between two dispersed droplets. Different approaches have been used in the literature to study the coalescence between two drops; using a droplet formed at a needle tip and forced against a planar interface of a bulk liquid phase [29][30][31][32] or against another droplet, [33][34][35] or by using microfluidic devices. 25,[36][37][38][39] The deformations undergone by the interfaces during the collision are of two types: shear deformation with a change of shape for a constant area and dilatational deformation associated with changes in the interfacial area.…”

Section: Introductionmentioning

confidence: 99%