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Fluids
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Advances in Electrohydrodynamic Flow
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Advances in Electrohydrodynamic Flow

A special issue of Fluids (ISSN 2311-5521). This special issue belongs to the section "Mathematical and Computational Fluid Mechanics".

Deadline for manuscript submissions: closed (20 July 2024) | Viewed by 2146

Special Issue Editors

Prof. Dr. Guillermo Artana

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Guest Editor
Laboratory of Fluid Dynamics, University of Buenos Aires, Buenos Aires 1063, Argentina
Interests: electrohydrodynamics; flow control; flow instabilities; bio fluid mechanics
Prof. Dr. Gerard Touchard

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Guest Editor
INSTITUT Pprime, University of Poitiers, 86000 Poitiers, France
Interests: flow electrification; interactions between flows and electrical phenomena

Special Issue Information

Dear Colleagues,

The electromechanical coupling between electric fields and fluids appears in different fields of applications, many of which are related to electrohydrodynamics phenomena where processes connected to electromagnetic waves’ propagation time are completed rapidly compared to those of interest, and where electric effects prevail over magnetic ones.

This Special Issue of Fluids is dedicated to recent advances in the experimental and numerical modeling of these electrohydrodynamic flows.

Emphasis will be given to applications and fundamentals involving low-temperature plasmas, Newtonian and non-Newtonian liquid, microfluidic flows, boundary layer separation, instabilities, granular materials and suspensions, blood and other biofluids, mixtures of fluids and particles, etc.

Prof. Dr. Guillermo Artana
Prof. Dr. Gerard Touchard
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fluids is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • electrohydrodynamics in liquids
  • plasma actuators and electroaerodynamics
  • electrostatic separation and precipitation
  • flow electrification
  • electrified jets and droplets
  • electrohydrodynamics in microfluidic systems

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (3 papers)

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Research

13 pages, 5765 KiB  
Article
The Characteristics of the Electro-Thermo-Convective Flow of a Dielectric Liquid Analyzed through the Electric Nusselt Number
by Dantchi Koulova, Philippe Traore and Hubert Romat
Fluids 2024, 9(10), 233; https://doi.org/10.3390/fluids9100233 - 3 Oct 2024
Viewed by 491
Abstract
This paper presents a fundamental study of electro-thermo-convective flows within a layer of dielectric liquid subjected to both an electric field and a thermal gradient. A low-conductivity liquid enclosed between two horizontal electrodes and subjected to unipolar charge injection is considered. The interplay [...] Read more.
This paper presents a fundamental study of electro-thermo-convective flows within a layer of dielectric liquid subjected to both an electric field and a thermal gradient. A low-conductivity liquid enclosed between two horizontal electrodes and subjected to unipolar charge injection is considered. The interplay between electric and thermal fields ignites complex physical interactions within the flows, all governed by a set of coupled electro-thermo-hydrodynamic equations. These equations include Maxwell, Navier–Stokes, and energy equations and are solved numerically using an in-house code based on the finite volume method. Electro-thermo-convective flows are driven by two dimensionless instability criteria: Rayleigh number Ra and the stability parameter T, and also by the dimensionless mobility parameter M and Prandtl number Pr. The electric Nusselt number (Ne) analogue to the Nusselt number (Nu) in pure thermal problems serves as an indicator to monitor the shift from a thermo- to an electro-convective flow and its eventual evolution into unsteady, and, later, chaotic flow. This change in regime is observed by tracking the electric Nusselt number’s behavior as a function of the stability parameter (T), for different values of the non-dimensional parameters (M, Ra, and Pr). The important role of mobility parameter M for the development of the flow is shown. The flow structure during different development stages in terms of the number of convective cells is also discussed. Full article
(This article belongs to the Special Issue Advances in Electrohydrodynamic Flow)
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16 pages, 4467 KiB  
Article
Coulomb Driven Electro-Convection within Two Stacked Layers of Miscible Dielectric Liquids
by Philippe Traore, Alberto T. Pérez, Subhadeep Mondal, Anandaroop Bhattacharya, Pedro A. Vázquez and Zelu Yan
Fluids 2024, 9(9), 219; https://doi.org/10.3390/fluids9090219 - 19 Sep 2024
Viewed by 575
Abstract
This article investigates the behavior of two parallel layers of different miscible dielectric liquids enclosed and sandwiched between two electrodes. By applying an electric potential to one electrode while grounding the other, electro-convection occurs when the electric Rayleigh number exceeds a critical value, [...] Read more.
This article investigates the behavior of two parallel layers of different miscible dielectric liquids enclosed and sandwiched between two electrodes. By applying an electric potential to one electrode while grounding the other, electro-convection occurs when the electric Rayleigh number exceeds a critical value, setting the fluid into motion and resulting in rapid mixing between the two liquids. A numerical model is developed to account for the varying ionic mobility and permittivity of the two liquids, considering their evolution based on the relative concentration field. The simulations confirm that electro-convection significantly enhances the mixing between the two liquids, as expected. Additionally, intriguing ripples are observed near the initial interface during the early stages of electro-convection instability growth. To explain and describe the flow dynamics in terms of stability analysis, a semi-analytical model is presented. This study provides insights into the mixing behavior and flow dynamics of miscible dielectric liquids under the influence of electro-convection. The findings contribute to a better understanding of the underlying mechanisms and can be valuable for applications such as microfluidics, energy conversion, and mixing processes. Further research is encouraged to explore additional parameters and optimize the control of electro-convection for practical applications. Full article
(This article belongs to the Special Issue Advances in Electrohydrodynamic Flow)
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18 pages, 1949 KiB  
Article
EHD Instabilities in Two Layers of Insulating and Conducting Immiscible Liquids Subjected to Unipolar Charge Injection
by Dantchi Koulova and Pierre Atten
Fluids 2024, 9(9), 200; https://doi.org/10.3390/fluids9090200 - 28 Aug 2024
Viewed by 655
Abstract
In this paper, the instability of two layers of insulating and conducting immiscible liquids separated by a deformable interface and subjected to unipolar injection is examined. Taking into account the slight deformation of the interface between the two liquids, a system of equations [...] Read more.
In this paper, the instability of two layers of insulating and conducting immiscible liquids separated by a deformable interface and subjected to unipolar injection is examined. Taking into account the slight deformation of the interface between the two liquids, a system of equations and boundary conditions is derived at marginal state. Non zero numerical solutions for both layers exist only for eigenvalues of the instability parameter T, which depends on the following parameters: injection level C, Bond number Bo, a new non-dimensional parameter P proportional to interfacial tension and the ratio of the layers’ thickness and of liquids viscosity. The variations in the instability criterion Tc, corresponding to the smallest eigenvalue, are examined in detail as a function of the main characteristic parameters C, P and the Bond number. We find that for some values of P, two instability mechanisms convective and interfacial ones can take place. When the strength of interfacial tension or the liquid thickness ratio is very low, the critical number tends to a value corresponding to interfacial instability. The influence of injection-induced convection in the insulating layer and the effect of interfacial deformation on interfacial instability are also discussed. Full article
(This article belongs to the Special Issue Advances in Electrohydrodynamic Flow)
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