Measurements of 3D slip velocities and plasma column lengths of a gliding arc discharge

Abstract

A non-thermal gliding arc discharge was generated at atmospheric pressure in an air flow. The dynamics of the plasma column and tracer particles were recorded using two synchronized high-speed cameras. Whereas the data analysis for such systems has previously been performed in 2D (analyzing the single camera image), we provide here a 3D data analysis that includes 3D reconstructions of the plasma column and 3D particle tracking velocimetry based on discrete tomography methods. The 3D analysis, in particular, the determination of the 3D slip velocity between the plasma column and the gas flow, gives more realistic insight into the convection cooling process. Additionally, with the determination of the 3D slip velocity and the 3D length of the plasma column, we give more accurate estimates for the drag force, the electric field strength, the power per unit length, and the radius of the conducting zone of the plasma column.

Translational, rotational, vibrational and electron temperatures of a gliding arc discharge

“…(4) is neglected in the uncertainty analysis since it can be accurately measured by the high-voltage probe. The uncertainty of the translational temperature δ Tt was estimated to be 24% from above-mentioned calculations, whereas the length is, on average, underestimated by about 13% due to a 3D effect [45]. Thus, the uncertainty of reduced electric field strength δ E/N is approximately 27%.…”

“…The electrodes are made of stainless steel tubes with an outer diameter of 3 mm that were cooled internally by water. A similar gliding arc discharge system has been described in our previous work [4,37,44,45]. An air flow was fed through a 3 mm-diameter circular nozzle between the two electrodes to extend the plasma column in an upward direction.…”

“…In addition, the electron temperature can be calculated using the reduced electric field strength that is dependent on simultaneous measurements of both the electric field strength and the translational temperature. In our earlier work, an AC gliding arc discharge was generated in atmospheric air, and temporally [37,44], spatially [45] and spectrally [38] resolved characteristics of the gliding arc discharge in atmospheric air were experimentally investigated. Glow-type and spark-type discharges can be recognized during the evolution of the gliding arc discharge [37,44].…”

Quasi‐Neutral Modeling of Gliding Arc Plasmas

“…In recent years, GADs attract increasing interest worldwide because of the above‐described interesting characteristics and thus, their importance in various applications. A considerable number of experiments have been conducted to study the slip velocity and column length, the dynamic behavior, and the electrical characterization . Apart from the experimental studies, several theoretical studies have also been performed .…”

Fluoropolymer coated alanine films treated by atmospheric pressure plasmas − In comparison with gamma irradiation

“…Unfortunately, plasma treatments at low pressures require expensive vacuum systems, and suitable methods are generally only well‐developed for batch or semi‐batch treatments. However, useful plasmas can also be generated at atmospheric pressure, obviating vacuum equipment and permitting the treatment of large objects and continuous processing of surfaces . It has been shown that in many cases surface treatment effects demonstrated with low‐pressure plasmas are achievable at atmospheric pressure as well…”