Plasma Torch
Mostrando 13-22 de 22 artigos, teses e dissertações.
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13. Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle
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 plasma carrying the discharge current wrapped by a relatively cold gas which thermally isolates the nozzle wall from the plasma). Seeking for a s
Brazilian Journal of Physics. Publicado em: 2004-12
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14. Synthesis of carbon nanostructures by using thermal plasma torch
Some recent results concerning the synthesis of carbon nanostructures in a thermal plasma generating by a plasma torch are presented. Several tests were carried out in different operational conditions. The plasma was formed with argon and different gas mixtures of argon-acetylene or argon-methane to which some catalyst materials (ferrocene and cerium oxide)
Brazilian Journal of Physics. Publicado em: 2004-12
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15. Experimental characterization of a low-current cutting torch
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 was anchored onto the cylinder lateral surface. The cathode-anode and cathode-nozzle voltage drops, together with the gas pressure in the plenum
Brazilian Journal of Physics. Publicado em: 2004-12
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16. Electrode erosion studies for plasma torches. / Estudo de materiais para eletrodos de tochas de plasma.
Thermal plasmas have shown a growing number of industrial applications. In most of those applications, the plasma torch (the device used to generate the thermal plasma) would need several hundred hours of using before anykind of maintenance, in spite of permit a continuous industrial process. The electrodes of the plasma torch, particularly the cathode, even
Publicado em: 2004
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17. Estudo de tochas de plasma atraves da teoria da similaridade
In this thesis, generalized equations for the voltage-current characteristics have been obtained for a non transferred arc plasma torch and for a transferred arc plasma torch, using the method of the Theory of the Similarity. For the non transferred arc plasma torch, the experimental data was obtained for air as the plasmagenic gas and for currents of 10 to
Publicado em: 2003
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18. Caracterização de escorias e recuperação do silicio / Characterization of slag and recovery of the silicon
Metallurgieal Grade Silicon (MGSi) is produced by a well-established industrial process that consists of the carbo-reduction of quartz in a submerged are fumace under high temperature. The process is an intensive energy consumption method (13 - 15 kWh to each kilogram of produced MGSi). After tapered, the MGSi is submitted to some purification stages in orde
Publicado em: 2003
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19. Mecanização e automação de metodologias de analise quimica : instrumentação para destilação seguida de detecção por (ICP OES) e para extração liquido-solido e detecção por espectrometria no visivel
In this work we present two equipment that were built from a common basis (an electronic interface): the first is a mechanized equipment capable of volatilizing compounds with boiling point up to 160°C and injecting them dírectly in to the torch of an inductively coupled plasma optical emission spectrometer. The equipment consists of a rotative tray that w
Publicado em: 2002
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20. Detecção por emissão atomica : comparação de celas de detecção utilizadas em analise cromatografica
A GC-MIP system consisting of a Gas Chromatograph coupled to a Microwave Induced Plasma detector was used to analyze hydrocarbons and organochlorinated compounds. The chromatographic data acquired at the emission lines of carbon, chlorine and hydrogen was used to evaluate the performance of the GC-MIP. Such studies were undertaken using the MIP with configur
Publicado em: 1996
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21. Automatização do diagnostico de tochas de plasma
An automated data acquisition system for the characterization of a plasma torch was developed. The system was applied to two types of (diagnostics: a study of external parameters of the plasma torch and a detailed study of temperature profiles of the plasma jet. The system was implemented through an analog-digital interface (A/D). The process of acquisition
Publicado em: 1993
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22. Caracterização de um maçarico de plasma
Experiments were made to determine the I x V characteristic and the thermal conversion efficiency of a 30 kW plasma torch at the Plasma Laboratory at Unicamp. Zhukov s scaling law (V ~ I-0.3) for a low mass flow of the gas and also the scaling law for the efficiency were both confirmed. For a high mass flow the scaling law is still V ~ I-a , but now with a �
Publicado em: 1988