Model of a transition from low to high ablation regime in a carbon arc

TL;DR

This paper presents a model explaining the transition between low and high ablation regimes in carbon arcs, validated by numerical solutions and experimental data, enhancing understanding of carbon nanotube synthesis processes.

Contribution

The paper introduces an analytical model that captures the transition between ablation regimes in carbon arcs considering background gas effects, validated against experiments.

Findings

Good agreement between model and experimental data

Analytical relations accurately describe ablation regimes

Model explains the influence of background gas on ablation rate

Abstract

Graphite ablation in a presence of inert background gas is widely used in different methods for the synthesis of carbon nanotubes, including electric arc and laser/solar ablation. The ablation rate is an important characteristic of the synthesis process. It is known from multiple arc experiments that there are two distinguishable ablation regimes, so-called "low ablation" and "high ablation" regimes in which the ablation rate behaves rather differently with variation of the arc parameters. We developed a model that explains low and high ablation regimes by taking into account the presence of a background gas and its effects on the ablation rate. We derive analytical relations for these regimes and verify them by comparing them with full numerical solutions in a wide arc parameter range. We comprehensively validate the model by comparing to multiple experimental data on the ablation rate in carbon arcs, where various arc parameters were varied. Good qualitative and quantitative agreement between full numerical solutions, analytical solutions, and experimental data was obtained.