Plasma sheath behavior and ionic wind effect in electric field modified flames

Xu, Kunning G.

doi:10.1016/j.combustflame.2013.12.008

Cited by 26 publications

(22 citation statements)

References 35 publications

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“…5 (for the lowish D/ used in this study) to increase, when D/ becomes more negative and the ''nozzle'' constitutes the cathode; this variation of the cathodic sheath's thickness will be demonstrated experimentally below. Recent calculations by Xu [59] have shown that the thickness of the cathodic sheath grows when D/ becomes larger. It has been suggested [23] that the sheath thickens as (D/) n , where 0.5 < n < 1.…”

Section: Electric Fields In a Flamementioning

confidence: 98%

“…This formula gives the plasma potential close to 1.0 V, which is probably an over-estimate, because of collisions being important at this flame's relatively high pressure. In fact, for a flame at atmospheric pressure, with both the burner and ''nozzle'' earthed, Xu [59] has calculated the potential of the bulk flame to be / $ +0.6 V. This is sufficient to repel most free electrons from the sampling cone, as well as to ensure that some move back to the burner, so the plot of / in Fig. 5 for D/ = 0 is established by the flame flowing from the burner to the ''nozzle''.…”

Section: Electric Fields In a Flamementioning

confidence: 99%

“…D/ = 0) and also negative ions, a sheath of positive ions, without any free electrons, normally blankets the metallic nozzle's exterior. In fact [1,22,23,[56][57][58][59], between the bulk flame plasma, in which there is a balance of the concentrations of positively and negatively charged species, and this sheath of positive ions, there is a pre-sheath region, where there are some free electrons without a balance of charges.…”

Section: Electric Fields In a Flamementioning

confidence: 99%

See 2 more Smart Citations

The effects of applying electric fields on the mass spectrometric sampling of positive and negative ions from a flame at atmospheric pressure

Hayhurst

Goodings

Taylor

2014

Combustion and Flame

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Section: Electric Fields In a Flamementioning

confidence: 98%

Section: Electric Fields In a Flamementioning

confidence: 99%

Section: Electric Fields In a Flamementioning

confidence: 99%

See 1 more Smart Citation

The effects of applying electric fields on the mass spectrometric sampling of positive and negative ions from a flame at atmospheric pressure

Hayhurst

Goodings

Taylor

2014

Combustion and Flame

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“…By the action of ionic wind, AC electric field had impact on the flame characteristics. The electric field can enhance the heat and mass transfer in the flame [12,40]. Maricq et al [41,42] proved that soot particles were generated in the combustion process and many of them were charged.…”

Section: Flame Behaviour and Ionic Wind Effectmentioning

confidence: 98%

Effect of alternating electric fields on the behaviour of small-scale laminar diffusion flames

Gan

Luo

Wang

et al. 2015

Applied Thermal Engineering

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“…The electric field effect on diffusion and premixed flames attract attention as a tool, which allows to control the flame shape, structure and the main flame characteristics, such as the flow velocity, flame temperature, composition, equivalence ratio and products composition [1][2][3][4][5][6]. There are different mechanisms of the electric field effect on the main flame characteristics.…”

Section: Introductionmentioning

confidence: 99%

Influence of electric field on thermo-chemical conversion of mixtures of straw pellets with coal

Kalis

Marinaki

Strautins

et al. 2018

Engineering for Rural Development

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Abstract. The recent research is focused on experimental study and mathematical modelling of the development of combustion dynamics at thermo-chemical conversion of biomass mixtures (straw pellets with crashed coal) with the aim to better understand the effect of electric field on the formation of the main gasification/ combustion characteristics when co-combusting straw with crashed coal. The experimental study and numerical modelling of the electric field effects on the combustion dynamics, when co-combusting straw pellets with coal, were carried out to ensure wider use of straw as a fuel for energy production providing the electrodynamic process control. The mathematical model considers the electric field influence on the combustion characteristics using the approximation of 2D axially symmetric compressible swirling flow and chemical reactions with account of the development of A→B↔C kinetics (A -reactant, B -intermediate product, C -final product) downstream the cylindrical combustor.Keywords: biomass pellets, electric field, chemical reactions, mathematical model. IntroductionThe electric field effect on diffusion and premixed flames attract attention as a tool, which allows to control the flame shape, structure and the main flame characteristics, such as the flow velocity, flame temperature, composition, equivalence ratio and products composition [1][2][3][4][5][6]. There are different mechanisms of the electric field effect on the main flame characteristics. First, at high current density, the electric field effect on the flame can be related to the flame heating, with an additional heat input into the flame (plasma support of combustion). Next, the electric body forceinduces an ion drift motion in the field direction.Inelastic collisions between the flame ions and the neutral flame species can then cause the ion wind effect promoting the interrelated processes of field-enhanced heat and mass transfer in the field direction. This can cause variations of the thermal decomposition of solid fuels and the combustion of volatiles. In addition, the electric field-induced inelastic collisions between the electrons and the flame species can cause variations of the rate of reactions. Finally, the flame dynamics can be controlled using the Lorentz force, when the electric field-induced current in the flame reaction zone creates a field-induced magnetic field with axial and radial components of the electromagnetic force, which influence the evolution of flow dynamics and flow vorticity [7]. Thus, multiple factors can influence the development of combustion dynamics, when the electric field is applied to the flame. In order to obtain predictable and controllable field effect on the main flame characteristics, one can vary such parameters as the electric field polarity, bias voltage and current density between the electrodes.More precise and systematic studies of the electric field effect on the combustion dynamics for different types of flames (diffusion, swirling, etc.) and fuels (gaseous, solid and their mixtures)...

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Plasma sheath behavior and ionic wind effect in electric field modified flames

Cited by 26 publications

References 35 publications

The effects of applying electric fields on the mass spectrometric sampling of positive and negative ions from a flame at atmospheric pressure

The effects of applying electric fields on the mass spectrometric sampling of positive and negative ions from a flame at atmospheric pressure

Effect of alternating electric fields on the behaviour of small-scale laminar diffusion flames

Influence of electric field on thermo-chemical conversion of mixtures of straw pellets with coal

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