An appropriate coupling of an arc plasma column in the state of local thermodynamic equilibrium to a refractory
cathode necessarily involves the non-equilibrium boundary layer between them. A model has been developed that
This dataset contains plasma parameters of microarcs generated between a cooled copper anode and a ceriated tungsten cathode by means of a one-dimensional unified non-equilibrium model for gap lengths between 15 and 200 µm and current densities from 2x10^5 up to 10^6 A/m^2. The data show that the decrease of the gap length down to a few tens of micrometers for a given current density results in a progressive shrinking of the quasineutral bulk in the microplasma and its complete disappearance.
Recent research of gas metal arc welding (GMAW) has proven that the sheath voltage dominates the total voltage fall in the current circuit and delivers most of the energy, which is finally transferred to the wire and the weld pool. This data set provides the results for droplet temperatures and the energy delivered to the wire anode in comparison with the sheath voltages. These quantities have been studied experimentally for a typical pulsed GMAW process in the one drop per pulse mode for mild steel under Ar with 2.5% CO2 with different peak currents from 350 to 650 A.
The relation between the voltage and the arc length in gas metal arc welding (GMAW) is an important characteristic. It depends on a complex distribution of the electric conductivity along the current path and does not depend on the arc length only. Based on electric measurements and the arc length determination from high-speed arc images, a simplified electrical model is introduced for a pulsed GMAW process. It shows the relation of voltage, current, arc length and free wire length and considers also their temporal evolution during the process in particular during the high-current phase.
The electron swarm parameters (bulk drift velocity, bulk longitudinal component of the diffusion tensor, and effective ionization frequency) in C2H6 (ethane) are investigated for a wide range of the reduced electric field by means of measurements and kinetic calculations. The dataset contains results of measurements in a scanning drift tube apparatus under time-of-flight conditions as well as of kinetic swarm calculations, using solutions of the electron Boltzmann equation and Monte Carlo simulations.
The electron swarm parameters (bulk drift velocity, bulk longitudinal component of the diffusion tensor, and effective ionization frequency) in C2H4 (ethylene) are investigated for a wide range of the reduced electric field by means of measurements and kinetic calculations. The dataset contains results of measurements in a scanning drift tube apparatus under time-of-flight conditions as well as of kinetic swarm calculations, using solutions of the electron Boltzmann equation and Monte Carlo simulations.
The electron swarm parameters (bulk drift velocity, bulk longitudinal component of the diffusion tensor, and effective ionization frequency) in C2H2 (acetylene) are investigated for a wide range of the reduced electric field by means of measurements and kinetic calculations. The dataset contains results of measurements in a scanning drift tube apparatus under time-of-flight conditions as well as of kinetic swarm calculations, using solutions of the electron Boltzmann equation and Monte Carlo simulations.
The dataset includes all the input and output files for the paper: Comparison of six simulation codes for positive streamers in air (https://doi.org/10.1088/1361-6595/aad768). Three test cases for axisymmetric positive streamers are described in the paper. The codes are of the finite volume or the finite element type, and they use both explicit and implicit time stepping. The computational domain and initial conditions are kept simple, so other codes can be compared relatively easily to the data published here.