Streamer propagation in air

Morrow, R.; Lowke, J. J.

doi:10.1088/0022-3727/30/4/017

Cited by 500 publications

(500 citation statements)

References 24 publications

Supporting

Mentioning

473

Contrasting

Unclassified

Order By: Relevance

“…The S ph term is the rate of electron-ion pair production due to photoionization in a gas volume. Transport parameters and reaction rates are taken from [16]. For the photoionization source term, the three-group SP 3 model is used [17] with boundary conditions given in [18].…”

Section: Model Descriptionmentioning

confidence: 99%

Surface charge deposition inside a capillary glass tube by an atmospheric pressure discharge in air

Jánský

Bourdon

2011

Eur. Phys. J. Appl. Phys.

View full text Add to dashboard Cite

To cite this version:J. Jánský, A. Bourdon. Surface charge deposition inside a capillary glass tube by an atmospheric pressure discharge in air. European Physical Journal: Applied Physics, EDP Sciences, 2011, 55 (1) Abstract. This paper presents simulations of the dynamics of surface charging by an air plasma discharge at atmospheric pressure initiated by a needle anode inside a capillary glass tube. During the discharge propagation in the tube, the highest positive surface charge density is observed close to the point electrode.We have shown that during the discharge propagation, the positive surface charge is increasing behind the discharge front, while the electric field at the surface is decreasing. Then, we have studied the influence of the tube radius, its permittivity and the applied pulsed voltage on surface charges. We have shown that the surface charge density during the discharge propagation is inversely proportional to the tube radius and surface charge densities of 30 − 50 nC/cm 2 for a tube with R tube = 100 µm and an applied voltage of 12 kV/cm have been obtained. We have also noted that a higher permittivity results in a higher surface charge density and a faster surface charge deposition. Then we have shown that the surface charge deposited is proportional to the applied voltage. Finally, at the end of the voltage pulse, our simulations indicate that the positive surface charge deposited during the discharge propagation in the tube decreases to very low values in few nanoseconds.

show abstract

Section: Model Descriptionmentioning

confidence: 99%

Surface charge deposition inside a capillary glass tube by an atmospheric pressure discharge in air

Jánský

Bourdon

2011

Eur. Phys. J. Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Ionic diffusion was not taken into account, as it does not play any significant role during the streamer propagation since the propagation lasts only for some hundreds of nanoseconds. Under these conditions, the system of continuity equations for densities of electrons, positive and negative ions was written in the following manner: ∂n e ∂t + div (n e w e + D e ∇n e ) = αn e |w e | − an e |w e | − β ep n e n p + S ph + S 0 ∂n p ∂t + div n p w p = αn e |w e | − β ep n e n p − β pn n p n n + S ph (1) ∂n n ∂t + div (n n w n ) = an e |w e | − β np n p n n where t is the time; n e , n p , n n are the number densities of electrons, positive ions and negative ions respectively; w e , w p , w n are the drift velocities of electrons, positive ions and negative ions respectively; α is the ionization coefficient; a is the net attachment coefficient taking into account twoand three-body attachment of electrons to oxygen molecules; D e is the diffusion coefficient for electrons; β ep , β pn are the coefficients of electron-ion and ion-ion recombinations respectively; S ph is the rate of photoionization; S 0 is the rate of appearance of initial electrons (see below).…”

Section: Basic Equationsmentioning

confidence: 99%

“…The magnitudes of the rate coefficients and their dependences on the electric field were taken from [1] except the formulae for the attachment coefficient. The dependence a(E) given in [14] The rate of ionization of oxygen molecules by absorption of photons that are radiated by excited molecules of nitrogen S ph was calculated according to [15] …”

Section: Basic Equationsmentioning

confidence: 99%

“…This condition describes the effect of the anode space-charge layer. The commonly used approach to represent initial conditions for the equation system (1) is the assumption that a quasi-neutral layer or 'plasma spot' exists in the gap, which initiates the discharge [1,3,4]. This appears to be artificial because the location of charges and their densities are set arbitrarily.…”

Section: Boundary and Initial Conditionsmentioning

confidence: 99%

“…In this case, the hydrodynamic mass balance equation for each accounted species, taking into account drift, diffusion and sources of appearance and disappearance, are employed in order to describe the dynamics of the gas in which the discharge takes place. At present, calculations of streamer discharges are performed using quasi two-dimensional [1,2], fully twodimensional [3][4][5] and even three-dimensional [6] models. The dimensionality of the model is an important factor determining authenticity of results concerning the detailed structure of the discharge channel.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The propagation of positive streamers in a weak and uniform background electric field

Serdyuk

Larsson

Gubanski

et al. 2001

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The results of numerical simulations of a positive streamer development in air in a weak and uniform electric field are presented. Streamer dynamics is considered in an electrode gap of 33 mm in length and the configuration was 'protrusion on a plate-plate'. This particular configuration was chosen in order to perform direct comparison between simulated results and experimental data. The electrostatic field in such a system decreases rapidly with increase of the distance from the protrusion (anode) and the region with a weak and uniform background field covers ∼30 mm of the gap. The parameters of the propagating streamer are studied at six different values of the background field strength: 0.24; 0.30; 0.345; 0.37; 0.43 and 0.50 MV m −1 . Stable streamer development (with constant velocity) takes place in a field of 0.5 MV m −1 (the stability field) but the streamer is able to cross the gap in a background field of 0.3 MV m −1 . These values are in excellent agreement with experimental data. During the stable streamer propagation, the electron density and plasma conductivity in the discharge channel and the electric field at its front remain constant. In a background field lower than 0.5 MV m −1 , the discharge front velocity and the electric field at the front decrease linearly with an increase of streamer length. The discharge propagation in the stability field is associated with an increase of electrostatic energy at the streamer front but it decreases if the streamer develops in a weaker electric field. This behaviour is accompanied by a constant Joule dissipation at 0.5 MV m −1 and decreasing energy losses at the streamer front in a weaker background electric field.

show abstract

Numerical simulations of compact intracloud discharges as the Relativistic Runaway Electron Avalanche‐Extensive Air Shower process

et al. 2014

View full text Add to dashboard Cite

[1] Compact intracloud discharges (CIDs) are sources of the powerful, often isolated radio pulses emitted by thunderstorms. The VLF-LF radio pulses are called narrow bipolar pulses (NBPs). It is still not clear how CIDs are produced, but two categories of theoretical models that have previously been considered are the Transmission Line (TL) model and the Relativistic Runaway Electron Avalanche-Extensive Air Showers (RREA-EAS) model. In this paper, we perform numerical calculations of RREA-EASs for various electric field configurations inside thunderstorms. The results of these calculations are compared to results from the other models and to the experimental data. Our analysis shows that different theoretical models predict different fundamental characteristics for CIDs. Therefore, many previously published properties of CIDs are highly model dependent. This is because of the fact that measurements of the radiation field usually provide information about the current moment of the source, and different physical models with different discharge currents could have the same current moment. We have also found that although the RREA-EAS model could explain the current moments of CIDs, the required electric fields in the thundercloud are rather large and may not be realistic. Furthermore, the production of NBPs from RREA-EAS requires very energetic primary cosmic ray particles, not observed in nature. If such ultrahigh-energy particles were responsible for NBPs, then they should be far less frequent than is actually observed.

show abstract

Streamer propagation in air

Cited by 500 publications

References 24 publications

Surface charge deposition inside a capillary glass tube by an atmospheric pressure discharge in air

Surface charge deposition inside a capillary glass tube by an atmospheric pressure discharge in air

The propagation of positive streamers in a weak and uniform background electric field

Numerical simulations of compact intracloud discharges as the Relativistic Runaway Electron Avalanche‐Extensive Air Shower process

Contact Info

Product

Resources

About