Listar por autor "Minotti, Fernando"
Mostrando ítems 1-8 de 8
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Cathode-sheath model for field emission sustained atmospheric pressure discharges
Cejas, Ezequiel; Prevosto, Leandro; Minotti, Fernando; Ferreyra, Matías; Chamorro, Juan Camilo; Fina, Brenda (2021)The cathode-sheath region of a discharge in atmospheric pressure air with a flat copper cathode is numerically investigated by using a simple fluid model that takes into account non-local ionization. The effects of the ... -
Experimental Characterization of a Low-Current Cutting Torch.
Kelly, Héctor; Mancinelli, Beatriz; Prevosto, Leandro; Minotti, Fernando; Márquez, Andrés (2004)An experimental characterization of a low-current (30-40 A) cutting torch is presented. To avoid contamination of the plasma arc by removed anode material, a rotating steel cylinder was used as the anode and the arc ... -
Hydrodynamic Model for the Plasma-Gas Flow in a Cutting Torch Nozzle.
Kelly, Héctor; Minotti, Fernando; Prevosto, Leandro; Mancinelli, Beatriz (2004)We present a simple hydrodynamic model to obtain the profiles of the relevant physical quantities along a nozzle of arbitrary cross-section in a cutting torch. The model uses a two-zone approximation (a hot central ... -
Investigation of the relevant kinetic processes in the initial stage of a double-arcing instability in oxygen plasmas.
Mancinelli, Beatriz; Prevosto, Leandro; Chamorro, Juan Camilo; Minotti, Fernando; Kelly, Héctor (2018)A numerical investigation of the kinetic processes in the initial (nanosecond range) stage of the double-arcing instability was developed. The plasma-sheath boundary region of an oxygen operated cutting torch was considered. ... -
Modelling of the Plasma–Sheath Boundary Region in Wall-Stabilized Arc Plasmas: Unipolar Discharge Properties.
Mancinelli, Beatriz; Prevosto, Leandro; Chamorro, Juan Camilo; Minotti, Fernando; Kelly, Héctor (2017)A two-dimensional model of the non-equilibrium unipolar discharge occurring in the plasma–sheath boundary region of a transferred-arc was developed. This model was used to study the current transfer to the nozzle (1 mm ... -
Numerical investigation of the double-arcing phenomenon in a cutting arc torch.
Mancinelli, Beatriz; Minotti, Fernando; Prevosto, Leandro; Kelly, Héctor (2014)A numerical investigation of the double-arcing phenomenon in a cutting arc torch is reported. The dynamics of the double-arcing were simulated by using a two-dimensional model of the gas breakdown development in the ... -
Numerical Simulation of the Voltage–Current Characteristic of an Atmospheric Pressure Discharge: The Glow‑to‑Arc Transition.
Cejas, Ezequiel; Prevosto, Leandro; Minotti, Fernando (2024)The glow-to-arc transition of a convection-stabilized atmospheric pressure air discharge is numerically investigated. Two separate models are considered: a one-dimensional axisym metric time-dependent fuid model of the ... -
On the Use of Sweeping Langmuir Probes in Cutting-Arc Plasmas—Part II: Interpretation of the Results.
Prevosto, Leandro; Kelly, Héctor; Minotti, Fernando (2008)A semiempirical Langmuir probe model is intro duced that is particularly adapted to high-energy-density cutting arcs, for which, as we have shown in Part I, the ion current collected by negatively biased probes shows no ...