Argon plume transition from a hollow swell to a diffuse swell with increasing amplitude of a trapezoidal voltage
Abstrak
Atmospheric pressure plasma jet can generate a remote plasma plume, which usually presents a conical or cylindrical morphology. Despite a few morphologies have been observed, efforts should be attempted to obtain more plume structures because streamer dynamics may be revealed from them. Aim to this purpose, an argon plasma plume excited by a trapezoidal voltage is investigated, which presents two kinds of swells (a hollow swell and a diffuse swell) with increasing voltage amplitude (Vp). Results indicate that there are two positive discharges (Dp1 and Dp2) and one negative discharge (Dn) per voltage cycle for both of the swells. With increasing Vp, inception voltage and discharge intensity increase for every positive discharge, while decrease for the negative discharge. Fast photography reveals that the positive streamer (Dp2) leaves different tracks in the two swells, which are curved in the hollow swell and randomly branched in the diffuse swell. The different tracks of Dp2 are explained through considering applied field strength and residual positive ions of Dp1. The existence of residual positive ions is verified from optical emission spectra at last.
Penulis (9)
Junyu Chen
Furong Zhang
P. Jia
Na Zhao
Kaiyue Wu
Jiacun Wu
J. Ran
X. Pang
Xuechen Li
Akses Cepat
- Tahun Terbit
- 2022
- Bahasa
- en
- Total Sitasi
- 5×
- Sumber Database
- Semantic Scholar
- DOI
- 10.1088/2058-6272/ac6570
- Akses
- Open Access ✓