Scaling law in liquid drop coalescence driven by surface tension

Wu, Mingming; Cubaud, Thomas; Ho, Chih‐Ming

doi:10.1063/1.1756928

Cited by 255 publications

(223 citation statements)

References 7 publications

(9 reference statements)

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“…1(a) is strongly reminiscent to the coalescence of two spherical drops, if we consider the substrate to act as a mirror-plane for the flow. This analogy was first employed by Biance et al 12 , who compared the spreading to the well-studied growth of the neck when two identical drops coalesce [13][14][15][16][17] . This approach has proven very successful in the low-viscosity limit.…”

Section: Introductionmentioning

confidence: 99%

Short time dynamics of viscous drop spreading

Eddi¹,

Winkels²,

Snoeijer³

2013

Physics of Fluids

154

166

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Liquid drops start spreading directly after coming into contact with a solid substrate. Although this phenomenon involves a three-phase contact line, the spreading motion can be very fast. We experimentally study the initial spreading dynamics, characterized by the radius of the wetted area, for viscous drops. Using high-speed imaging with synchronized bottom and side views gives access to 6 decades of time resolution. We show that short time spreading does not exhibit a pure power-law growth. Instead, we find a spreading velocity that decreases logarithmically in time, with a dynamics identical to that of coalescing viscous drops. Remarkably, the contact line dissipation and wetting effects turn out to be unimportant during the initial stages of drop spreading.

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Section: Introductionmentioning

confidence: 99%

Short time dynamics of viscous drop spreading

Eddi¹,

Winkels²,

Snoeijer³

2013

Physics of Fluids

154

166

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“…Recently, significant theoretical [169] and numerical [170] progress has been made in the description of the neck growth, step (iii), and in understanding the singularity that occurs during coalescence. Very recently, experiments have observed the initial viscous coalescence [171], as well as the inertial coalescence [172,173], which follows the viscous coalescence.…”

Section: Introductionmentioning

confidence: 99%

The interface in demixed colloid–polymer systems: wetting, waves and droplets

Aarts

2007

Soft Matter

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By comparison, the interfacial tension between the coexisting phases has received little attention. Here, we show that the ultralow interfacial tension in fluid-fluid demixed colloid-polymer systems, which is roughly one million times smaller than in ordinary liquids, manifests itself in a wide variety of interface characteristics and processes. Discussed are the interfacial wetting behaviour close to a hard wall, the thermal capillary waves at the free interface and the process of droplet coalescence and breakup. These subjects can be studied in a single experiment by combining modern soft matter chemistry and laser scanning confocal microscopy. This combination allows a further exploration of a broad range of interface issues.

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“…The hydrodynamics of droplet coalescence can be explained in the context of diffusion or capillary forces [16], viscous forces [17][18][19][20], inertial forces [21,22] and interfacial forces [22,23]. Especially, droplet coalescence has been studied extensively for systems dealing with microfluidics [24][25][26][27] is retained on the sieve [31,32], centrifugation, Osmotic pressure, micromanipulation [33], rheology, turbidity and electro-kinetic [34].…”

Section: Breaking and Coalescencementioning

confidence: 99%

Toward a new experimental method for measuring coalescence in bitumen emulsions: A study of two bitumen droplets

Khan

Redelius²,

Kringos

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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This is the published version of a paper published in Colloids and Surfaces A: Physicochemical and Engineering Aspects. Citation for the original published paper (version of record):Khan, A., Redelius, P., Kringos, N. (2016) Toward a new experimental method for measuring coalescence in bitumen emulsions: A study of two bitumen droplets. Colloids and Surfaces• A new experimental method to study coalescence of two bitumen droplets is presented.• The developed test procedure is a novel state of art, quite simple and repeatable.• It is possible to study the coalescence process in bitumen emulsions on a large scale.• This method will serve its widespread applicability in cold mix asphalt technology. Cold mix asphalt (CMA) emulsion technology could become an attractive alternative for the road industry due to low startup and equipment installation costs, diminished energy consumption and reduced environmental impact. The performance of cold asphalt mixtures produced from emulsions is strongly influenced by a good control of the breaking and coalescence process. The wetting of bitumen on the surface of the aggregates is hereby of major importance for the performance of the asphalt. Premature coalescence of the bitumen emulsions away from the surface, could lead to poor adhesion and decreased mechanical strength of the asphalt. Today, the breaking and coalescence mechanisms of bitumen emulsions are still not fully understood due to their complexities and the lack of fundamental experimental methods and existing models. However, in the past years efforts have been made in defining relationships for understanding the bitumen emulsions. In this paper, a new experimental method is presented to study coalescence of bitumen by using shape relaxation of bitumen droplets in an emulsion environment. The coalescence of spherical droplets of different bitumen have been correlated with neck growth, densification and surface area change during the coalescence process. The test protocol was designed in a controlled climate chamber, to study the coalescence process with varying environmental conditions. The kinetics of the relaxation process was influenced by the temperature as well as other parameters. * Corresponding author. The research showed that the developed test procedure is repeatable and able to study the coalescence process on a larger scale. However, the relationship between the measured parametric relationships at the larger scale and the bitumen emulsion scale still needs further investigation. g r a p h i c a l a b s t r a c t a r t i c l e i n f o

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Scaling law in liquid drop coalescence driven by surface tension

Cited by 255 publications

References 7 publications

Short time dynamics of viscous drop spreading

Short time dynamics of viscous drop spreading

The interface in demixed colloid–polymer systems: wetting, waves and droplets

Toward a new experimental method for measuring coalescence in bitumen emulsions: A study of two bitumen droplets

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