Listar por autor "Prevosto, Leandro"
Mostrando ítems 41-56 de 56
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On the Gas Heating Mechanism for the Fast Anode Arc Reattachment in a Non-transferred Arc Plasma Torch Operating with Nitrogen Gas in the Restrike Mode.
Prevosto, Leandro; Kelly, Héctor; Mancinelli, Beatriz; Chamorro, Juan Camilo (2015)The present work provides a detailed kinetic analysis of the time-resolved dynamics of the gas heating during the arc reattachment in nitrogen gas in order to understand the main processes leading to such a fast reattachment. ... -
On the influence of the nozzle length on the arc properties in a cutting torch
Prevosto, Leandro; Kelly, Héctor; Risso, Marcelo Natalio; Infante, Damián Leandro (2009)In this work, an experimental study on the influence of the nozzle geometry on the physical properties of a cutting arc is reported. Ion current signals collected by an electrostatic probe sweeping across a 30 A oxygen ... -
On the physical origin of the nozzle characteristic and its connection with the double-arcing phenomenon in a cutting torch.
Prevosto, Leandro; Kelly, Héctor; Mancinelli, Beatriz (2009)The nozzle current-voltage characteristic for a cutting arc is presented in this work. The measurements are reported using a high energy density cutting arc torch with a nozzle bore radius of 0.5 mm. The arc current was ... -
On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime
Prevosto, Leandro; Kelly, Héctor; Mancinelli, Beatriz; Chamorro, Juan Camilo; Cejas, Ezequiel (2015-02-06)Low-frequency (100 Hz), intermediate-current (50 to 200 mA) glow discharges were experimentally investigated in atmospheric pressure air between blunt copper electrodes. Voltage–current characteristics and images of the ... -
On the reduction of the third-order harmonic losses in low–voltage power cables used for feeding large LED and CFL lighting loads.
Milardovich, Natalio; Prevosto, Leandro; Lara, Miguel Ángel; Milardovich, Diego (2017)An experimental investigation of diversity factors for LED (light emitting diode) in combination with CFL (compact fluorescent lamps) and LED lamps is presented in this paper. Attention was paid to the reduction of ... -
On the space-charge boundary layer inside the nozzle of a cutting torch.
Prevosto, Leandro; Kelly, Héctor; Mancinelli, Beatriz (2009)A numerical study of the space-charge sheath adjacent to the nozzle wall of a cutting torch is presented. The hydrodynamic model corresponds to a collision-dominated sheath and does not assume cold ions, so drift-diffusion-type ... -
On the Use of Sweeping Langmuir Probes in Cutting Arc Plasmas—Part I: Experimental Results.
Prevosto, Leandro; Kelly, Héctor; Mancinelli, Beatriz (2008)The first study of Langmuir probes applied to cut ting arcs using a sweeping-probe system is presented. It is found that, under a relatively broad range of experimental conditions (changes in the probe material, in 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 ... -
On the use of the double floating probe method to infer the difference between the electron and the heavy particles temperatures in an atmospheric pressure, vortexstabilized nitrogen plasma jet.
Prevosto, Leandro; Kelly, Héctor; Mancinelli, Beatriz (2014)Sweeping double probe measurements in an atmospheric pressure direct current vortex-stabilized plasma jet are reported (plasma conditions: 100 A discharge current, N2 gas flow rate of 25 Nl/min, thoriated tungsten rod-type ... -
On the use of the metallic nozzle of a cutting arc torch as a Langmuir probe.
Prevosto, Leandro; Kelly, Héctor; Mancinelli, Beatriz (2008)The region inside the nozzle (bore diameter ≈1 mm) of a cutting arc torch is inaccessible to most plasma diagnostics, and numerical simulations are the only means to find out the relative importance of several physical ... -
Physicochemical Properties and Time Stability of Plasma Activated Water by a Liquid-Cathode Glow-Type Discharge in Air: The Effect of Air Confinement.
Santamaría, Brenda; Ferreyra, Matías; Chamorro, Juan Camilo; Cejas, Ezequiel; Fina, Brenda; Prevosto, Leandro; ; https://orcid.org/0000-0001-7046-2188; https://orcid.org/0000-0002-9833-1662; https://orcid.org/0000-0001-5386-5516; https://orcid.org/0000-0002-8771-9549 (2023)Nonthermal discharges in atmospheric pressure air in contact with water produce large amounts of reactive species in the gas phase that can enter into the water by diffusion, thus inducing the formation of secondary ... -
Plasma Cutting of Concrete: Heat Propagation and Molten Material Removal From the Kerf.
Chamorro, Juan Camilo; Prevosto, Leandro; Cejas, Ezequiel; Milardovich, Natalio; Mancinelli, Beatriz; Fischfeld, Gerardo (2019)An experimental investigation of heat propagation in the case of plasma cutting of concrete is reported. The experiments were carried out by using a high-enthalpy nitrogen plasma jet generated in a dc vortex-stabilized ... -
Quantitative Schlieren Diagnostic Applied to a Nitrogen Thermal Plasma Jet.
Chamorro, Juan Camilo; Prevosto, Leandro; Cejas, Ezequiel; Kelly, Héctor (2018)— A quantitative interpretation of the schlieren technique applied to an atmospheric pressure, vortex-stabilized nitrogen thermal plasma jet generated in a direct-current nontransferred arc plasma torch (nitrogen gas ... -
Quantitative Schlieren Diagnostics Applied to a Millisecond Pulsed‑DC Hybrid Discharge in Atmospheric Pressure Air.
Cejas, Ezequiel; Chamorro, Juan Camilo; Prevosto, Leandro (2022)The gas temperature of a hybrid discharge in atmospheric pressure air is investigated by using quantitative schlieren imaging. The discharge is stabilized in a pin-to-plate electrode geometry and operated in a millisecond ... -
Schlieren technique applied to the arc temperature measurement in a high energy density cutting torch.
Prevosto, Leandro; Artana, Guillermo; Kelly, Héctor; Mancinelli, Beatriz (2010)Plasma temperature and radial density profiles of the plasma species in a high energy density cutting arc have been obtained by using a quantitative schlieren technique. A Z-type two-mirror schlieren system was used in ... -
The Impact of the Use of Large Non-Linear Lighting Loads in Low-Voltage Networks.
Milardovich, Natalio; Prevosto, Leandro; Lara, Miguel; Milardovich, Diego (IntechOpen., 2018)The principal numerical and experimental results obtained by the authors on the har monic power losses in low-voltage networks in the lighting area have been summarized in this review. Light-emitting diodes (LEDs) and ...