Electrocoalescence threshold enhancement under pulsed electric fields in a specific frequency range

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Electrocoalescence threshold enhancement under pulsed electric fields in a specific frequency range. / Kostin, P.; Chirkov, V.

In: Journal of Electrostatics, Vol. 140, 104265, 01.03.2026.

Research output: Contribution to journal › Conference article › peer-review

BibTeX

@article{af4d65ed9fd84946858123ce0d9f48ae,

title = "Electrocoalescence threshold enhancement under pulsed electric fields in a specific frequency range",

abstract = "Electrocoalescence of water droplets in oil is a key mechanism in crude oil dehydration, yet the effectiveness of pulsed electric fields is not fully explained. This study uses numerical simulation of droplet pairs to investigate conditions under which the electrocoalescence threshold exceeds that of a constant field. The analysis covers variations in duty cycle, droplet radius, viscosity, and interfacial tension. A frequency range is identified where the root-mean-square threshold increases, reaching up to 20% at a duty cycle of 12.5%. The effect is strongest at an Ohnesorge number ( Oh ) near 0.5, diminishes at higher values ( Oh > 1.5), and does not intensify further at lower values. The phenomenon appears linked to droplet relaxation and collision dynamics, while resonance may overlap but is not its primary cause. These results clarify the physical basis of threshold elevation under pulsed fields and provide guidance for optimizing electrocoalescer performance in industrial emulsion separation. {\textcopyright} 2026 Elsevier B.V.",

keywords = "Arbitrary Lagrangian–Eulerian method, Electrocoalescence, Electrodeformation, Emulsion separation, Numerical simulation, Pulsed electric field, Water-in-oil emulsion, Crude oil, Drops, Electric fields, Emulsions, Numerical methods, Numerical models, Arbitrary Lagrangian Eulerian method, Duty-cycle, Electro deformations, Emulsion separations, Frequency ranges, Specific frequencies, Water droplets, Water-in-oil emulsions, Emulsification",

author = "P. Kostin and V. Chirkov",

note = "Export Date: 23 February 2026; Cited By: 0; Correspondence Address: P. Kostin; St. Petersburg State University, St. Petersburg, Russian Federation; email: p.kostin@spbu.ru; null ; Conference date: 22-06-2025 Through 26-06-2025",

year = "2026",

month = mar,

day = "1",

doi = "10.1016/j.elstat.2026.104265",

language = "Английский",

volume = "140",

journal = "Journal of Electrostatics",

issn = "0304-3886",

publisher = "Elsevier",

url = "https://electrostatics.org/annual-meeting-2/",

}

RIS

TY - JOUR

T1 - Electrocoalescence threshold enhancement under pulsed electric fields in a specific frequency range

AU - Kostin, P.

AU - Chirkov, V.

N1 - Export Date: 23 February 2026; Cited By: 0; Correspondence Address: P. Kostin; St. Petersburg State University, St. Petersburg, Russian Federation; email: p.kostin@spbu.ru

PY - 2026/3/1

Y1 - 2026/3/1

N2 - Electrocoalescence of water droplets in oil is a key mechanism in crude oil dehydration, yet the effectiveness of pulsed electric fields is not fully explained. This study uses numerical simulation of droplet pairs to investigate conditions under which the electrocoalescence threshold exceeds that of a constant field. The analysis covers variations in duty cycle, droplet radius, viscosity, and interfacial tension. A frequency range is identified where the root-mean-square threshold increases, reaching up to 20% at a duty cycle of 12.5%. The effect is strongest at an Ohnesorge number ( Oh ) near 0.5, diminishes at higher values ( Oh > 1.5), and does not intensify further at lower values. The phenomenon appears linked to droplet relaxation and collision dynamics, while resonance may overlap but is not its primary cause. These results clarify the physical basis of threshold elevation under pulsed fields and provide guidance for optimizing electrocoalescer performance in industrial emulsion separation. © 2026 Elsevier B.V.

AB - Electrocoalescence of water droplets in oil is a key mechanism in crude oil dehydration, yet the effectiveness of pulsed electric fields is not fully explained. This study uses numerical simulation of droplet pairs to investigate conditions under which the electrocoalescence threshold exceeds that of a constant field. The analysis covers variations in duty cycle, droplet radius, viscosity, and interfacial tension. A frequency range is identified where the root-mean-square threshold increases, reaching up to 20% at a duty cycle of 12.5%. The effect is strongest at an Ohnesorge number ( Oh ) near 0.5, diminishes at higher values ( Oh > 1.5), and does not intensify further at lower values. The phenomenon appears linked to droplet relaxation and collision dynamics, while resonance may overlap but is not its primary cause. These results clarify the physical basis of threshold elevation under pulsed fields and provide guidance for optimizing electrocoalescer performance in industrial emulsion separation. © 2026 Elsevier B.V.

KW - Arbitrary Lagrangian–Eulerian method

KW - Electrocoalescence

KW - Electrodeformation

KW - Emulsion separation

KW - Numerical simulation

KW - Pulsed electric field

KW - Water-in-oil emulsion

KW - Crude oil

KW - Drops

KW - Electric fields

KW - Emulsions

KW - Numerical methods

KW - Numerical models

KW - Arbitrary Lagrangian Eulerian method

KW - Duty-cycle

KW - Electro deformations

KW - Emulsion separations

KW - Frequency ranges

KW - Specific frequencies

KW - Water droplets

KW - Water-in-oil emulsions

KW - Emulsification

UR - https://www.mendeley.com/catalogue/c1f54267-0d11-3651-9a45-73f34e0604a6/

U2 - 10.1016/j.elstat.2026.104265

DO - 10.1016/j.elstat.2026.104265

M3 - статья в журнале по материалам конференции

VL - 140

JO - Journal of Electrostatics

JF - Journal of Electrostatics

SN - 0304-3886

M1 - 104265

Y2 - 22 June 2025 through 26 June 2025

ER -

ID: 149216427