Direct numerical simulation of electrohydrodynamic plumes generated by a hyperbolic blade electrode

Wu, Jian; Traoré, Philippe; Louste, Christophe; Koulova, Dantchi; Romat, H.

doi:10.1016/j.elstat.2012.10.011

Cited by 23 publications

(22 citation statements)

References 10 publications

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“…It is worth noting that the blade is represented as a realistic surface rather than an injecting line/point at a plane (e.g., like it is in [24,26]). This allows setting the injection charge formation at an area around the tip (e.g., like it is in [13,25]) and thus avoiding the problem with very steep change in space charge density near the injecting point. All computations were for a half (the right-hand one) of the cell due to the reflection symmetry, with the corresponding part being given at all two-dimensional plots below.…”

Section: Mathematical and Computer Modelsmentioning

confidence: 99%

“…Secondly, the system (unlike that with a point electrode) can be used to cool an extended heat source. At last, it is a quite common design of EHDHE, which is used in a number of experimental and simulation works [8,[22][23][24][25]. The geometry of computer model and the boundary conditions for the set of equations are given in Fig.…”

Section: Mathematical and Computer Modelsmentioning

confidence: 99%

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The Dependence of the Efficiency of Electrohydrodynamic Heat Exchanger on the Electric Conductivity of Liquid

Чирков

Rodikova

Stishkov

2017

IEEE Trans. on Ind. Applicat.

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Abstract-Electrohydrodynamic (EHD) flows are of great interest due to their capability of intensifying the heat exchange. However, the electric conductivity of liquid is typically disregarded, and the model of unipolar injection is used. The paper studies the effect of liquid conductivity on the efficiency of EHD heat exchanger with charge formed by injection as well as field-enhanced dissociation. The investigation involved computer simulation of the complete set of EHD equations supplemented with that for the heat transfer. The range of low-voltage conductivity of working liquid, when electroconvection can be used for heat transfer enhancement, was estimated. The EHD heat exchanger based on the field-enhanced dissociation is shown to be very promising for dielectric liquids with heightened conductivity.

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Section: Mathematical and Computer Modelsmentioning

confidence: 99%

Section: Mathematical and Computer Modelsmentioning

confidence: 99%

The Dependence of the Efficiency of Electrohydrodynamic Heat Exchanger on the Electric Conductivity of Liquid

Чирков

Rodikova

Stishkov

2017

IEEE Trans. on Ind. Applicat.

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“…Great efforts have been made to accurately simulate electroconvective phenomena induced by unipolar charge injection in both plate-plate [20]- [24] and blade-plane configurations [25]- [31]. At the present stage, numerical studies with EHD plumes mainly focus on the modeling of electrodes with different shapes and incorporating different injection laws to link the injected charge density at the emitter to the local electric field at the electrode.…”

mentioning

confidence: 99%

“…A fair good agreement was found for the longitudinal velocity profile. Recently, EHD plumes in a hyperbolic blade-plane configuration were simulated [31]. In this paper, autonomous and nonautonomous injection laws were considered and compared.…”

mentioning

confidence: 99%

Numerical Investigation of Electrohydrodynamic Plumes for Locally Enhanced Cooling in Dielectric Liquids

Traoré

Louste

et al. 2015

IEEE Trans. on Ind. Applicat.

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In this paper, we numerically explored the potential application of electrohydrodynamic (EHD) plumes in cooling local regions with high temperature. The EHD plume is induced by ion injection from a sharp metallic blade immersed in a dielectric liquid. A 2-D simulation which took into account all relevant physical variables for EHD plumes in a nonisothermal liquid was performed. It is found that both the local and average Nusselt numbers dramatically increase with the increase of the electric Rayleigh number (T ) and the injection strength parameter (C).However, for the same T and C, the heat transfer augmentation effect is stronger for small Rayleigh numbers (Ra), which can be understood by comparing the relative importance between Coulomb force and buoyancy force.

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“…Recent det ailed comput at ional invest igat ions have been conduct ed [17,18,19] t hat have also focused on analysing t he format ion of t he roll st ruct ures which has included spat ial dist ribut ions of charge and velocity magnit ude as well as t emporal variat ions in t hese quant it ies [1,20].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of electrohydrodynamic roll structures in laminar planar Couette flow

Kourmatzis¹,

Shrimpton²

2015

J. Phys. D: Appl. Phys.

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A bst r act .T he behaviour of an incompressible dielect ric liquid subject ed t o a laminar planar Couet t e ow wit h unipolar charge inject ion is invest igat ed numerically in two dimensions. T he comput at ions show new morphological charact erist ics of roll st ruct ures t hat arise in t his forced elect ro-convect ion problem. T he charge and velocity magnit ude dist ribut ions between t he two parallel elect rodes are discussed as a funct ion of t he t op wall velocity and t he EHD Rayleigh number, T for t he case of st rong charge inject ion. A wide enough paramet ric space is invest igat ed such t hat t he observed EHD roll st ruct ures progress t hrough t hree regimes. T hese regimes are de ned by t he presence of a single or double-roll free convect ive st ruct ure as observed elsewhere [1], a sheared or st ret ched roll st ruct ure, and nally by a regime where t he perpendicular velocity gradient is su cient t o prevent t he generat ion of a roll. T hese t hree regimes have been delineat ed as a funct ion of t he wall t o ionic drift velocity U W = E , and t he T number. In t he st ret ched regime, an increase in U W = E can reduce charge and moment um uct uat ions whilst in parallel de-st rat ify charge in t he region between t he two elect rodes. T he st ret ched roll regime is also charact erised by a subst ant ial in uence of U W = E on t he st eady development t ime, however in t he t radit ional non-st ret ched roll st ruct ure regime, no in uence of U W = E on t he development t ime is not ed.

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Direct numerical simulation of electrohydrodynamic plumes generated by a hyperbolic blade electrode

Cited by 23 publications

References 10 publications

The Dependence of the Efficiency of Electrohydrodynamic Heat Exchanger on the Electric Conductivity of Liquid

The Dependence of the Efficiency of Electrohydrodynamic Heat Exchanger on the Electric Conductivity of Liquid

Numerical Investigation of Electrohydrodynamic Plumes for Locally Enhanced Cooling in Dielectric Liquids

Characteristics of electrohydrodynamic roll structures in laminar planar Couette flow

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