ac electric fields drive steady flows in flames

Drews, Aaron M.; Cademartiri, Ludovico; Chemama, Michael; Brenner, Michael P.; Whitesides, George M.; Bishop, Kyle J. M.

doi:10.1103/physreve.86.036314

Cited by 48 publications

(39 citation statements)

References 18 publications

(17 reference statements)

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“…Governing equations were derived based on a simplified model from a previous work [20], where only ions were included in the analysis of current behavior with flames. Here, we extended these governing equations to accommodate for the large difference in the mobility between ions and electrons because electrons account for a considerable portion of the negatively charged particles in flames.…”

Section: A Simplified Model and Simulationmentioning

confidence: 99%

“…This system of equations was solved with the ordinary differential equation solver ODE23t in MATLAB software using the method of lines approach. A first-order upwind discretization was used on clustered grid points near the boundaries and the location of the ion source [20].…”

Section: A Simplified Model and Simulationmentioning

confidence: 99%

“…The width parameter a of the ion generation profile g was set at 1 mm to approximate typical flame thickness. Ionization rate coefficient k i was selected as 1×10 20 ions/m 3 -s [32] and recombination rate coefficient k r was 2.4×10 -13 m 3 /ions-s [32]. Figure 3 shows the current density plotted against the mean field intensity defined as V a /L.…”

Section: The Ionized Layer At the Center Of A Gapmentioning

confidence: 99%

“…Collisional momentum transfer from the charged particles to neutrals leads to a modification of a local flow field, known as an ionic wind effect [1,3,[17][18][19][20]. Such an ionic wind can be associated with an electric current due to external electric fields.…”

Section: Introductionmentioning

confidence: 99%

“…In the sub-saturated regime, space charges redistribute to minimize their potential, shielding the electric field and limiting the current, but in the saturated regime, no further space charges remain in the flame zone-all generated ions and electrons migrate toward their corresponding electrode. In this case, the saturated current is limited by the effective rate of charged particle generation in the flame [20,23]. Therefore, a saturated current is understood to be an intrinsic property of a flame with a given mixture, temperature, pressure and flow conditions.…”

Section: Introductionmentioning

confidence: 99%

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DC field response of one-dimensional flames using an ionized layer model

Xiong

Park

Lee

et al. 2016

Combustion and Flame

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Abstract:We develop a simplified model to better explain electric current response when direct current (DC) is applied to a flame. In particular, different current responses have been observed by changing the polarity of the DC in a sub-saturated current regime that results from the presence of ions and electrons in the flame zone. A flame zone was modeled as a thin, ionized layer located in one-dimensional DC electric fields. We derived simplified model-governing equations from species equations by implementing mobility differences dependent on the type of charged particle, particularly between ions and electrons; we performed experiments to substantiate the model. Results showed that the sub-saturated current and local field intensity were significantly influenced by the polarity of the DC because of the combined effect of unequal mobility of charged particles and the position of the ionized layer in the gap relative to two electrodes. When an energized electrode is close to the ionized layer, applying a negative DC causes a more rapid increase in current than by applying a positive DC to the same electrode.Results from our experimental measurement of current using counterflow diffusion flames agreed qualitatively well with the model predictions. A sensitivity analysis using dimensional and non-dimensional parameters also supported the importance of the mobility difference and the relative location of the ionized layer on the electric current response.

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Section: A Simplified Model and Simulationmentioning

confidence: 99%

Section: A Simplified Model and Simulationmentioning

confidence: 99%

Section: The Ionized Layer At the Center Of A Gapmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

DC field response of one-dimensional flames using an ionized layer model

Xiong

Park

Lee

et al. 2016

Combustion and Flame

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Study on the electrical response of small ethanol‐air diffusion flame under the uniform electric field

2020

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Ethanol is a renewable alternative fuel in many application areas. The external electric field is applied to assist the small ethanol diffusion flame in this study. The electrical response of flame under the uniform electric field is discussed. A reduced chemical mechanism of ethanol is used to establish a numerical model corresponding to the experimental system. The characteristics of current-electric field strength, equivalent resistance, distribution of charged species, velocity field, and reaction rate are studied. The results show that the electric field brings significant effects on the combustion and electrical characteristics of flame. As the electric field strength increases, the current through the circuit and the equivalent resistance of the flame show a three-stage variation. The current increases first (0-40 kV/m), then stabilizes (40-70 kV/m) and then continues to increase (70-100 kV/m) with the increase of the electric field

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