The inexorable resistance of inertia determines the initial regime of drop coalescence

Paulsen, Joseph D.; Burton, Justin; Nagel, Sidney R.; Appathurai, Santosh; Harris, Michael T.; Basaran, Osman A.

doi:10.1073/pnas.1120775109

Cited by 162 publications

(259 citation statements)

References 33 publications

(102 reference statements)

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“…As the membranes twist around each other, the connecting bridge expands in width, eventually producing a circularly shaped defect-free daughter membrane. In conventional coalescence, the rate of neck expansion is determined by hydrodynamic and inertial forces 3 . By contrast, the significantly slower neck expansion in membrane coalescence is dominated by the rate at which the two membranes rotate with respect to each other.…”

Section: Resultsmentioning

confidence: 99%

“…In order for the droplets to coalesce, a rupture must occur between two merging interfaces which, coupled with surface tension and hydrodynamic forces, leads to energetic barriers and non-trivial coalescence progression [1][2][3][4][5] . For complex fluids with partial positional and/or orientational order, the complexity of the coalescence reactions increases considerably 6 .…”

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confidence: 99%

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Imprintable membranes from incomplete chiral coalescence

et al. 2014

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Coalescence is an essential phenomenon that governs the equilibrium behaviour in a variety of systems from intercellular transport to planetary formation. In this report, we study coalescence pathways of circularly shaped two-dimensional colloidal membranes, which are one rod-length-thick liquid-like monolayers of aligned rods. The chirality of the constituent rods leads to three atypical coalescence pathways that are not found in other simple or complex fluids. In particular, we characterize two pathways that do not proceed to completion but instead produce partially joined membranes connected by line defects-p-wall defects or alternating arrays of twisted bridges and pores. We elucidate the structure and energetics of these defects and ascribe their stability to a geometrical frustration inherently present in chiral colloidal membranes. Furthermore, we induce the coalescence process with optical forces, leading to a robust on-demand method for imprinting networks of channels and pores into colloidal membranes.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Imprintable membranes from incomplete chiral coalescence

et al. 2014

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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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“…Paulsen et al used an electrical method and high-speed imaging to describe the droplets coalescence. They showed that the outer uid had a small e ect on the coalescence dynamics [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A note on the critical gap of bubble coalescence during foaming process: A diffuse-interface modeling

Rad

2017

Scientia Iranica

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Abstract. Bubble coalescence is an important stage of foaming process. A goal of foaming is to produce numerous, uniform-size bubbles. Therefore, suppression of bubble coalescence is desirable during foaming process. For stationary bubbles, if their distance is less than a critical gap, they will coalesce. Actually, in this case, attractive forces attract the outer surfaces to touch each other and form a growing gas bridge, which nally merges the bubbles. For bigger distance, the attractive forces cannot make a bridge and coalescence will not happen. In this study, the dynamics of bubble coalescence are modeled using a di use-interface LBM. Then, critical gap of bubble coalescence is de ned as the maximum distance between the stationary bubbles where the coalescence will happen. Sensibility of critical gap is obtained with respect to critical properties of material, bubble size, viscosity of gas and liquid, density ratio, surface tension, temperature, and interface thickness. The results show that interface thickness is the only factor that controls the critical gap. In other words, in the case of stationary bubbles, by a precise estimation of interface thickness, the coalescence can be predicted. Critical gap is a useful parameter in foaming where the maximum number of bubbles is desirable.

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The inexorable resistance of inertia determines the initial regime of drop coalescence

Cited by 162 publications

References 33 publications

Imprintable membranes from incomplete chiral coalescence

Imprintable membranes from incomplete chiral coalescence

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

A note on the critical gap of bubble coalescence during foaming process: A diffuse-interface modeling

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