Formation of dissipative structures in a three-dimensional electro-thermo-convective flow

Luo, Kang; Gao, Xue-Lin; He, Xuerao; Yi, Hong-Liang; Wu, Jian

doi:10.1103/physrevfluids.7.043701

Cited by 15 publications

(5 citation statements)

References 50 publications

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“…It was also shown that at the beginning of the ETC process a pattern of rolls is formed, which develops into polygons, and finally into a more regular hexagonal pattern. 171 The pore development in PAA in many ways resembles the self-adjusting ETC evolution presented by Luo et al 171 giving indication that PAA formation, at least at the early stages of anodization, can be governed prevalently by the electro-thermo-dynamics.…”

Section: A Pinch Of Theory On the Paa Growthmentioning

confidence: 70%

“…It should be noted that temperature gradient near the anode surface due to Joule heating might be also an important contribution to the vortices generated during anodization. Luo et al 171 considered combined effects of an electric field and a thermal gradient simultaneously applied to a horizontal dielectric fluid layer leading to electro-thermo-convective (ETC) instabilities. The stability criteria, involving both electric Rayleigh number (T c ) and Rayleigh number (R a ), were obtained under a special initial perturbation conditions resulting in a regular ETC hexagonal pattern.…”

Section: A Pinch Of Theory On the Paa Growthmentioning

confidence: 99%

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Self-Ordered Porous Anodic Alumina with Large Pore Intervals: Review on Experimental and Theoretical Research

Norek¹

2022

J. Electrochem. Soc.

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The production of self-organized porous anodic alumina (PAA) with large intepore intervals (Dc > 380 nm) is still under development. The PAA is very interesting for applications in optics and photonics where a large-scale periodicity corresponding to visible or infrared light is required. However, the process remains challenging because it usually involves anodization under high voltages that is prone to instabilities and breakdown events. The basic problem relies on harnessing the electrochemical conditions to find a balance between various phenomena that occur during transformation from aluminum to porous alumina. The overall process is quite complicated but it is believed that regularity of pore formation is governed mainly by an equilibrated counter-ion (Al3+ and electrolyte anions A-) exchange at the electrolyte/oxide interface. Accordingly, a new concept of PAA growth is proposed which takes into account three basic elements of field-enhanced dissolution, plastic flow, and electro-convective models. The results on recent achievements in the high-voltage anodization is discussed focusing on the strategies that led to the self-ordering growth of PAA with large Dc. It is hoped that the review will contribute to better designing of anodization parameters to produce the ordered porous material with desired morphology.

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Section: A Pinch Of Theory On the Paa Growthmentioning

confidence: 70%

Section: A Pinch Of Theory On the Paa Growthmentioning

confidence: 99%

Self-Ordered Porous Anodic Alumina with Large Pore Intervals: Review on Experimental and Theoretical Research

Norek¹

2022

J. Electrochem. Soc.

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“…2021; He, Sun & Zhang 2022; Luo et al. 2022; Zhang et al. 2023) and other classical fluid dynamics problems (Appelquist & Schlatter 2014; Peplinski et al.…”

Section: Methodsmentioning

confidence: 99%

“…It is important to mention that EC and thermal convection have several similarities, i.e. the buoyance and electric force are both body forces, the heat or mass transfer is strongly dependent on plumes motion, and the large-scale circulations (LSCs) in both flow all dominant in convection and mass (heat) transport (Lacroix et al 1975;Atten, McCluskey & Perez 1988;Castaing et al 1989;Atten & Malraison 1990;Funfschilling & Ahlers 2004;Brown & Ahlers 2007;Traoré & Pérez 2012;Ni, Huang & Xia 2015;Luo et al 2022). Nevertheless, EC and thermal convection are two intrinsically different flows (where Rayleigh-Bénard convection (RBC) is now taken as representative of thermal convection).…”

Section: Introductionmentioning

confidence: 99%

“…1989; Atten & Malraison 1990; Funfschilling & Ahlers 2004; Brown & Ahlers 2007; Kourmatzis & Shrimpton 2012; Traoré & Pérez 2012; Ni, Huang & Xia 2015; Luo et al. 2022). Nevertheless, EC and thermal convection are two intrinsically different flows (where Rayleigh–Bénard convection (RBC) is now taken as representative of thermal convection).…”

Section: Introductionmentioning

confidence: 99%

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Coulomb-driven electroconvection turbulence in two-dimensional cavity

Zhang,

Chen,

Luo

et al. 2024

J. Fluid Mech.

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A comprehensive direct numerical simulation of electroconvection (EC) turbulence caused by strong unipolar charge injection in a two-dimensional cavity is performed. The EC turbulence has strong fluctuations and intermittency in the closed cavity. Several dominant large-scale structures are found, including two vertical main rolls and a single primary roll. The flow mode significantly influences the charge transport efficiency. A nearly $Ne \sim T^{1/2}$ scaling stage is observed, and the optimal $Ne$ increment is related to the mode with two vertical rolls, while the single roll mode decreases the charge transport efficiency. As the flow strength increases, EC turbulence transitions from an electric force-dominated mode to an inertia-dominated mode. The former utilizes the Coulomb force more effectively and allocates more energy to convection. The vertical mean profiles of charge, electric field and energy budget provide intuitive information on the spatial energy distribution. With the aid of the energy-box technique, a detailed energy transport evolution is illustrated with changing electric Rayleigh numbers. This exploration of EC turbulence can help explain more complicated electrokinetic turbulence mechanisms and the successful utilization of Fourier mode decomposition and energy-box techniques is expected to benefit future EC studies.

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Effect of the Coulomb and dielectric forces on the onset of Rayleigh-Bénard convection

Du,

Vázquez,

2024

Acta Mech. Sin.

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Formation of dissipative structures in a three-dimensional electro-thermo-convective flow

Cited by 15 publications

References 50 publications

Self-Ordered Porous Anodic Alumina with Large Pore Intervals: Review on Experimental and Theoretical Research

Self-Ordered Porous Anodic Alumina with Large Pore Intervals: Review on Experimental and Theoretical Research

Coulomb-driven electroconvection turbulence in two-dimensional cavity

Effect of the Coulomb and dielectric forces on the onset of Rayleigh-Bénard convection

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