Numerical prediction of transient electrohydrodynamic instabilities under an alternating current electric field and unipolar injection

Zhou, Chu-Tong; Yao, Zhen-Ze; Chen, Di-Lin; Luo, Kang; Wu, Jian; Yi, Hong-Liang

doi:10.1016/j.heliyon.2023.e12812

Cited by 3 publications

(1 citation statement)

References 64 publications

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“…Electric field combined to heat transfer has garnered growing consideration in the past few years due to its wide scope of benefits in many engineering fields, such as the formation of crystals in a liquid, nuclear reactors cooling, electronic equipment thermal dissipation, as well as microelectronic devices, solar technology, fuel cells [1], etc. During the last decades, several leading journals covered various issues of electrohydrodynamic improvement of heat transfer [2][3][4] within square, cylindrical, and elliptical cavities. An intensive study of EHD convection was given by Hassen et al [2].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Electro-Thermo Convection in an Inclined Cavity Filled with a Dielectric Fluid

Akrour,

Elkhazen,

Hassen

et al. 2023

Processes

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The present work is a numerical analysis of electro-thermo convection, occurring in a square differentially heated cavity filled with a dielectric fluid. The cavity experiences the combined effects of viscous, electrical, and thermal forces. The equations modelling the physical problem are solved via the finite volume approach. The study focuses on the effect of cavity tilt on the fluid flow structure and thermal performance inside the enclosure under the action of an electric field. A parametric study was performed, where the tilt angle is getting varied between 0° and 90°, as well as the Rayleigh number (5000 ≤ Ra ≤ 250,000) and the electric field (0 ≤ T ≤ 800). Furthermore, the electric charge injection level C, the mobility M and the Prandtl Pr numbers were all adjusted to a value of 10. The obtained results demonstrate that the hydrodynamic and thermal fields are significantly impacted by the cavity inclination. In addition, regardless of the thermal Rayleigh’s number, high electric field values could govern fluid movement through electric forces. Electro-convection typically demonstrates an oscillating flow due to the tilting of the cavity which gives rise to a bicellular regime occupying the entire cavity. A correlation has been established to estimate heat transfer by considering various system parameters such as cavity inclination, electrical Rayleigh number, and thermal Rayleigh number.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Electro-Thermo Convection in an Inclined Cavity Filled with a Dielectric Fluid

Akrour,

Elkhazen,

Hassen

et al. 2023

Processes

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Effect of magnetic field on electroconvection in a thin layer of magnetic nanofluid

Ahmed¹,

Zakinyan

Wahab

2023

Chemical Physics Letters

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Electro-Thermo-Convection of a Dielectric Liquid in the External DC and AC Electric Fields

Nekrasov

Smorodin

2023

Mathematics

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The electro-thermo-convection of a dielectric liquid in a horizontal capacitor is investigated under the autonomous charge injection from the cathode and heating from above. In the case of a DC electric field, the linear stability analysis is carried out, and the thresholds of monotonic and oscillatory instability are determined. The finite difference method is used for the numerical simulation of the nonlinear behavior of electro-thermo-convective patterns: stationary convection and traveling waves. In the case of AC, electric field transient and permanent oscillations are analyzed. Two types of stable solutions are found. The modulated traveling waves are characterized by the quasiperiodic oscillations of convective characteristics. Another solution is modulated electroconvection (MEC). The patterns of MEC oscillate around some average flow synchronously with the external AC field and do not move laterally. The average intensity of convective mixing in modulated traveling waves is several times less than in modulated electroconvection. The spatiotemporal evolution of the stream function, temperature, and charge distributions for different types of transient and permanent solutions are analyzed.

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Numerical prediction of transient electrohydrodynamic instabilities under an alternating current electric field and unipolar injection

Cited by 3 publications

References 64 publications

Numerical Investigation of the Electro-Thermo Convection in an Inclined Cavity Filled with a Dielectric Fluid

Numerical Investigation of the Electro-Thermo Convection in an Inclined Cavity Filled with a Dielectric Fluid

Effect of magnetic field on electroconvection in a thin layer of magnetic nanofluid

Electro-Thermo-Convection of a Dielectric Liquid in the External DC and AC Electric Fields

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