Simulation of Droplet-Formation and -Interaction in Emulsification Processes

Krause, F.; Li, Xingang; Fritsching, Udo

doi:10.1080/19942060.2011.11015382

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…The results after τ = 8 ms are not shown for case C because, with all the used meshes, the two craters merge, such that the crater depth is still reproduced well, but the crater shape is substantially altered, and the agreement is completely lost. With the VOF approach, air regions coming into contact merge instantaneously because the underlying model is not able to represent retarded coalescence (modified models would be needed, e.g., see [53]). On the other hand, real-world interfaces may resist even with direct contact-at least for a certain time-if the pressure of the contacting regions is not too different (e.g., bouncing bubbles or drops).…”

Section: Validation Against Experimental Datamentioning

confidence: 99%

Synchronized Multiple Drop Impacts into a Deep Pool

Guilizzoni

Santini

Fest-Santini

2019

Fluids

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Drop impacts (onto dry or wet surfaces or into deep pools) are important in a wide range of applications, and, consequently, many studies, both experimental and numerical, are available in the literature. However, such works are focused either on statistical analyses of drop populations or on single drops. The literature is heavily lacking in information about the mutual interactions between a few drops during the impact. This work describes a computational fluid dynamics (CFD) study on the impact of two, three, and four synchronized drops into a deep pool. The two-phase finite-volume solver interFoam of the open source CFD package OpenFOAM® was used. After validation with respect to high speed videos, to confirm the performance of the solver in this field, impact conditions and aspects that would have been difficult to obtain and to study in experiments were investigated: namely, the energy conversion during the crater evolution, the effect of varying drop interspace and surface tension, and multiple drop impacts. The results show the very significant effect of these aspects. This implies that an extension of the results of single-drop, distilled-water laboratory experiments to real applications may not be reliable.

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Section: Validation Against Experimental Datamentioning

confidence: 99%

Synchronized Multiple Drop Impacts into a Deep Pool

Guilizzoni

Santini

Fest-Santini

2019

Fluids

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“…In view of the fact that several previous studies have demonstrated the feasibility of the VOF method on investigating the drop coalescence in the external flow field, the current mathematical model has the ability to numerically predict both the coalescence and the collision between the interacting drops in the shear flow [43][44][45]. Notably, herein, we concentrate on investigating the hydrodynamics of the collision between two drops which usually plays a considerable role in several practical applications including solvent extraction and emulsification [22].…”

Section: B Mathematical Modelmentioning

confidence: 99%

Hydrodynamic interaction of two deformable drops in confined shear flow

Chen

Wang

2014

Phys. Rev. E

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We investigate hydrodynamic interaction between two neutrally buoyant circular drops in a confined shear flow based on a computational fluid dynamics simulation using the volume-of-fluid method. The rheological behaviors of interactive drops and the flow regimes are explored with a focus on elucidation of underlying physical mechanisms. We find that two types of drop behaviors during interaction occur, including passing-over motion and reversing motion, which are governed by the competition between the drag of passing flow and the entrainment of reversing flow in matrix fluid. With the increasing confinement, the drop behavior transits from the passing-over motion to reversing motion, because the entrainment of the reversing-flow matrix fluid turns to play the dominant role. The drag of the ambient passing flow is increased by enlarging the initial lateral separation due to the departure of the drop from the reversing flow in matrix fluid, resulting in the emergence of passing-over motion. In particular, a corresponding phase diagram is plotted to quantitatively illustrate the dependence of drop morphologies during interaction on confinement and initial lateral separation.

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“…They found that the final position of the drop is independent of its initial position. Krause and Fritsching [5] exhibited a correction of the standard VOFmodel for multiphase flow using a separate phase indicator for every single droplet (multiple entity models).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of off-centre binary collision of droplets in a horizontal channel

Goodarzi

Nadooshan

Bayareh

2018

J Braz. Soc. Mech. Sci. Eng.

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The collision between two off-centre water droplets in horizontal channels is investigated. Three-dimensional simulations are performed for fully developed, laminar, unsteady and incompressible flow. Volume of Fluid (VOF) computational method is used to calculate the fluid flow. The first droplet is separated from the channel wall and the second one moves by the flow in the center of the channel. The effects of Weber number, Reynolds number, density ratio, viscosity ratio, the ratio of droplet size and impact factor on the elongation and maximum velocity of droplets are investigated after coalescence. A correlation coefficient is obtained for elongation according to the dimensionless parameters. The results show that the elongation curve is sinusoidal due to the tendency of droplets to achieve a spherical shape. The velocity of droplets before collision relative to the velocity of droplets after coalescence is twice.

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Simulation of Droplet-Formation and -Interaction in Emulsification Processes

Cited by 10 publications

References 22 publications

Synchronized Multiple Drop Impacts into a Deep Pool

Synchronized Multiple Drop Impacts into a Deep Pool

Hydrodynamic interaction of two deformable drops in confined shear flow

Numerical investigation of off-centre binary collision of droplets in a horizontal channel

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