Electric discharge contour dynamics model: the effects of curvature and finite conductivity

TL;DR

This paper derives a contour model for electrical discharges considering curvature and finite conductivity, providing explicit solutions, numerical methods, and validation against experimental data.

Contribution

It presents a complete derivation of an effective contour model from the minimal streamer model, including explicit solutions and numerical implementation for finite resistivity.

Findings

Derived the asymptotic contour model equations for electrical discharges.

Computed dispersion relations for cylindrical symmetry and finite resistivity.

Validated model predictions with experimental streamer discharge data.

Abstract

In this paper we present the complete derivation of the effective contour model for electrical discharges which appears as the asymptotic limit of the minimal streamer model for the propagation of electric discharges, when the electron diffusion is small. It consists of two integro-differential equations defined at the boundary of the plasma region: one for the motion and a second equation for the net charge density at the interface. We have computed explicit solutions with cylindrical symmetry and found the dispersion relation for small symmetry-breaking perturbations in the case of finite resistivity. We implement a numerical procedure to solve our model in general situations. As a result we compute the dispersion relation for the cylindrical case and compare it with the analytical predictions. Comparisons with experimental data for a 2-D positive streamers discharge are provided and predictions confirmed.