{ "help": "Return the metadata of a dataset (package) and its resources. :param id: the id or name of the dataset :type id: string", "success": true, "result": { "id": "0e609bc7-3a55-4b13-95ca-a0f9d5b2813a", "url": "https://www.inptdat.de/node/530/", "source": { "name": "single-filament DBD", "application": "basic research", "specification": "AC, atmospheric pressure, non-thermal", "properties": "
The object of interest is streamer-surface interaction and the cathode-layer formation during the first discharge event in the single-filament dielectric barrier discharge (DBD) in argon at atmospheric pressure. The modelling is performed for the DBD in an asymmetric arrangement with a 1.5 mm gap, electrode radius of 2 mm and 0.5 mm thick dielectric (alumina, relative permittivity 9) covering grounded electrode, driven by sinusoidal voltage (voltage amplitude of 3 kV and frequency 60 kHz).
\n" }, "medium": { "name": "Ar", "properties": "Pure argon, gas pressure is 760 Torr, constant gas temperature of 300 K
\n" }, "target": [], "diagnostics": { "name": "fluid-Poisson model, plasma chemical model", "properties": "Model: Fluid-Poisson model in cylindrical geometry;
\nComputational software: COMSOL Multiphysics\u00ae v. 5.6 (www.comsol.com, COMSOL AB, Stockholm, Sweden);
\nNumerical method: Finite element method;
\nElement type: Linear Lagrange elements for particle balance equations, quadratic Lagrange elements for Poisson equation, linear discontinuous Lagrange elements for the surface charge density balance equation;
\nTime-stepping: Backward differentiation formula (BDF), with automatically adapted time-step size and the BDF order (in the range from 1 to 5);
\nSolver: Fully coupled constant Newton solver, with the direct linear solver (PARDISO);
\nTolerance: 0.0001
\nMesh: Remeshing is done to reduce calculation time, where the continuation of the calculations from the last calculated time step is done after each remeshing. The whole presented time range is calculated with four remeshings:
\n1) t: [0, 3.9] microseconds, number of mesh elements: 360194, DoF: 3340893;
\n2) t: [3.9, 3.94793] microseconds, number of mesh elements: 360194, DoF: 3340893;
\n3) t: [3.94793, 3.955] microseconds, number of mesh elements: 401562, DoF: 3726070;
\n4) t: [3.955, 4] microseconds, number of mesh elements: 572190, DoF: 5172073;
\n5) t: [4, 4.03] microseconds, number of mesh elements: 464810, DoF: 4153330;
\nCalculated currents, surface charge density and the total charge for different time intervals were post-processed in Origin Pro (https://www.originlab.com/). The number densities, electric field and electron production rates were exported using LiveLink\u2122 for MATLAB\u00ae (https://www.comsol.com/livelink-for-matlab) and post-processed using python3 (https://www.python.org) and Matplotlib (https://matplotlib.org).
An atmospheric-pressure DBD in argon is investigated by means of time-dependent and spatially two-dimensional fluid-Poisson modelling in an axisymmetric geometry. The characteristic structure consisting of the volume streamer propagating just above the dielectric and simultaneous development of an additional surface discharge near the cathode during the initial discharge is observed and explained. The model comprises a set of balance equations for the particle number densities of electrons and the most important argon species (atomic Ar+ and molecular Ar2+ ions, as well as the lumped excited atomic Ar\u2217 and molecular Ar2\u2217 states of argon), Poisson\u2019s equation for the electric potential and field, the electron energy balance equation and a balance equation for the surface charge density. The quasi-neutral initial conditions and physically-based boundary conditions, accounting for thermal flux and partial reflection of the particles, are used. The additional term describing the ion-induced emission of secondary electrons is included into the boundary conditions for the balance equations for the particle number density and energy density of electrons.
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