Numerical Study of the Collision and Coalescence of Water Droplets in an Electric Field

Mohammadi, Mehdi; Shahhosseini, Shahrokh; Bayat, Mahmoud

doi:10.1002/ceat.201200479

Cited by 27 publications

(17 citation statements)

References 41 publications

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“…More recently, Takahashi 14 and, 2 years later, Creux et al 15 measured the zeta potential of air/water interfaces, confirming the analysis of Loeb 13 that an electrical double layer exists at a gas/liquid interface related to a dielectric constant. Collision and coalescence were analyzed and simulated by Mohammadi et al 16.…”

Section: Theorymentioning

confidence: 99%

Electrostatic Charge Measurements of Droplets of Various Liquids Falling over a Large Distance

Lüttgens¹,

Lüttgens²,

Thulin³

et al. 2015

Chem Eng & Technol

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In order to contribute to a better understanding of the electrostatic phenomena appearing during splash filling of liquids and to clarify the reasons why this process is suspected to increase static electrification especially due to atomization, accurate experiments of charge measurements were made on droplets of various liquids falling over a large distance (5 m). Eleven liquids of different conductivity and surface tension were tested. The results confirm that no charge evolution appears even over a long falling distance. A possible explanation of the static charge increase in splash filling is presented.

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Section: Theorymentioning

confidence: 99%

Electrostatic Charge Measurements of Droplets of Various Liquids Falling over a Large Distance

Lüttgens¹,

Lüttgens²,

Thulin³

et al. 2015

Chem Eng & Technol

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show abstract

“…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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“…The approach process is mainly dominated by the electrostatic force and the drag force. The time for the approach process depends on not only the waveform and strength of electric field but also the droplet radius, the initial separation distance, the skew angle between the electric field and the central axis of two droplets, and fluid properties, such as viscosity and permittivity . When the initial separation distance is far greater than the droplet radius, the electrostatic force can be calculated by a point dipole model .…”

Section: Introductionmentioning

confidence: 99%

Non‐coalescence behavior of neutral droplets suspended in oil under a direct current electric field

Huang

Luo

et al. 2019

AIChE Journal

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The excessive electric field gives rise to droplet non-coalescence and droplet chains in the electric dehydrator, which severely deteriorates oil-water separation efficiency and even leads to short circuit. To reveal the underlying mechanism of droplet noncoalescence, dynamic behavior of two neutral droplets in silicone oil under a direct current electric field is investigated by using high-speed photography. The experimental results show that there exists a critical electric field strength above which two droplets will bounce off after the contact. The critical electric field strength of droplet non-coalescence is affected by the initial separation distance between droplets, the radius of droplet, and the surfactant concentration. Whether the non-coalescence behavior occurs in the electric field is determined by the competition of electric force and capillary force, which dominates the evolution of tiny connection channel.

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Numerical Study of the Collision and Coalescence of Water Droplets in an Electric Field

Cited by 27 publications

References 41 publications

Electrostatic Charge Measurements of Droplets of Various Liquids Falling over a Large Distance

Electrostatic Charge Measurements of Droplets of Various Liquids Falling over a Large Distance

Hydrodynamic interaction of two deformable drops in confined shear flow

Non‐coalescence behavior of neutral droplets suspended in oil under a direct current electric field

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