Ion current density profiles in negative corona gaps versus EHD confinements

A. Bouarouri (1) , N. Jidenko (2) , F. Gensdarmes (3) , D. Maro (4) , D. Boulaud (5) , J.-P. Borra (2)

1 CNRS - Centre National de la Recherche Scientifique
2 LPGP - Laboratoire de physique des gaz et des plasmas
3 IRSN/PSN-RES/SCA/LPMA - Laboratoire de physique et de métrologie des aérosols
4 IRSN/PSE-ENV/SRTE/LRC - Laboratoire de Radioécologie de Cherbourg-Octeville
5 IRSN/PSE-ENV - Pôle Santé Environnement- Direction Environnement

This paper deals with the electric and hydrodynamic confinement of negative ions in a point-to-plane corona discharge gap. Radial ion current density profiles have been measured on the earthed planar electrode, drilled in the axis of the point. The experimental setup is first validated by comparison with the Warburg's law without injected gas flow rate. The gas injected in the gap and blown from the discharge gap through the hole located at the centre of the plane affects neither the electric field close to the point nor the subsequent electric wind. However, it leads to the confinement of ions flux towards the central symmetry axis in the low electric field region up to a critical gas velocity, which for no more effect is measurable. Hence, electro hydro-dynamics confinement of ions can be achieved by limiting the outward radial expansion of ions to increase ion current densities on specific locations close to the low field planar electrode. © 2015 Elsevier B.V.

Domaines: Physique [physics]

A. Bouarouri, N. Jidenko, F. Gensdarmes, D. Maro, D. Boulaud, et al.. Ion current density profiles in negative corona gaps versus EHD confinements. Journal of Electrostatics, 2016, 82, pp.88-95. ⟨10.1016/j.elstat.2015.08.005⟩. ⟨hal-02558448⟩