Experimental Study on the Thermal Argon Plasma Generation and Jet Length Change Characteristics at Atmospheric Pressure

Pan, Wenxia; Meng, Xie; Wu, Chengzhang; Chen, Xi

doi:10.1007/s11090-006-9000-z

Cited by 35 publications

(32 citation statements)

References 12 publications

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“…With the same DC non-transferred arc plasma torch, both laminar and turbulent thermal plasma jets can be generated in experiments [17,18,21] and thus it is possible to compare the characteristics of laminar and turbulent thermal plasma jets for a given plasma torch. Experimental observations [17,18,21] show that silent long laminar plasma jets and noisy short turbulent plasma jets are generated at lower and higher flow rates, respectively.…”

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confidence: 99%

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Comparison of Laminar and Turbulent Thermal Plasma Jet Characteristics—A Modeling Study

Cheng

Chen

Pan

2006

Plasma Chem Plasma Process

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Modeling results are presented to compare the characteristics of laminar and turbulent argon thermal plasma jets issuing into ambient air. The combined-diffusion-coefficient method and the turbulence-enhanced combined-diffusion-coefficient method are employed to treat the diffusion of ambient air into the laminar and turbulent argon plasma jects, respectively. It is shown that since only the molecular diffusion mechanism is involved in the laminar plasma jet, the mass flow rate of ambient air entrained into the laminar plasma jet is comparatively small and less dependent on the jet inlet velocity. On the other hand, since turbulent transport mechanism is dominant in the turbulent plasma jet, the entrainment rate of ambient air into the turbulent plasma jet is about one order of magnitude larger and almost directly proportional to the jet inlet velocity. As a result, the characteristics of laminar plasma jets are quite different from those of turbulent plasma jets. The length of the high-temperature region of the laminar plasma jet is much longer and increases notably with increasing jet inlet velocity or inlet temperature, while the length of the high-temperature region of the turbulent plasma jet is short and less influenced by the jet inlet velocity or inlet temperature. The predicted results are reasonably consistent with available experimental observation by using a DC arc plasma torch at arc currents 80-250 A and argon flow rates (1.8-7.0)×10 −4 kg/s.

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confidence: 99%

“…Experimental observations [17,18,21] show that silent long laminar plasma jets and noisy short turbulent plasma jets are generated at lower and higher flow rates, respectively. Between the laminar and turbulent flow regimes there exists an unsteady transitional flow regime.…”

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confidence: 99%

Comparison of Laminar and Turbulent Thermal Plasma Jet Characteristics—A Modeling Study

Cheng

Chen

Pan

2006

Plasma Chem Plasma Process

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“…[24], a 150 Hz arc voltage and current fluctuation inherited from the power supply have been identified. In our previous work, a similar 300 Hz fluctuation also exists [20][21][22][23]. In these cases, the amplitude of energy fluctuations in plasma might be larger than the arc voltage fluctuations.…”

Section: Introductionmentioning

confidence: 55%

“…With a long IEI channel, the arc length may be extended much longer than that in self-setting arc length torches, which leads to higher arc voltage for a given input power. Our previous research shows that in a non-transferred dc plasma torch with IEI, the arc voltage of argon plasma can reach about 50 V at atmospheric pressure [20], while in a reduced pressure chamber, the arc voltage can reach 75 V [21]. When a certain power level is needed for an arc, such a combination of higher voltage with lower current intensities is preferred in some applications because with lower current, there might be less heat loss and electrode erosion [10].…”

Section: Introductionmentioning

confidence: 99%

Energy Fluctuations in a Direct Current Plasma Torch with Inter-Electrode Inserts Operated at Reduced Pressure

Huang

Pan

2011

Plasma Chem Plasma Process

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Direct current (dc) plasma torch with inter-electrode inserts has the merits of fixed arc length, relative high enthalpy and may show advantages in future plasma processes where stability and controllability are must-have. Energy fluctuations in the plasma may result from power supply ripple, arc length variation, and/or acoustic oscillation. Using an improved power supply with a flat waveform, the characteristics of an argon plasma energy instabilities under reduced pressure were studied by means of simultaneously monitoring the arc voltage and arc current spectrum. Dependence of the arc fluctuation behavior on the plasma generating parameters, such as the current intensity, the plasma gas flow rates and the vacuum chamber pressure were investigated and discussed. Results show that the plasma torch has a typical U-shaped voltage-ampere characteristic (VAC). The correlation between the VAC and the probability of energy distributions was studied. Through pressure measurements at the cathode cavity and the vacuum chamber, the existence of sonic flow in the inter-electrode insert channel was confirmed.

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“…The rapidly melted powder is accelerated toward the substrate surface and deposited to form a coating [4]. The performance of a plasma spray coating depends on various parameters such as, plasma power, gas flow rate, stand-off distance and design of plasma spray gun [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

The investigation of the microstructure behavior of the spray distances and argon gas flow rates effects on the aluminum coating using self-generated atmospheric plasma spray system

2017

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In the present paper, our aims are the investigation of the effects of the spray parameters of the aluminum-coated layer on the microstructure and mechanical properties. For this purpose, we use the self-generated atmospheric plasma spray system for coating of aluminum on the carbon steel substrate to protect it against corrosion degradation. This system allows us to achieve the best choice for parameters. In this paper, the effects of spray distance and argon flow rate on the characteristics of aluminum coating are investigated. To obtain the results, the analyses are used such as X-ray diffraction, scanning electron microscope, micro hardness of the coating by Vickers method, and adhesion strength behaviors by pulloff test. The results show that the porosity increases with increasing distance. This phenomenon reduces the hardness and adhesion, which is clearly evident in our results. The other important conclusion is that, if the gas flow rate increases, the porosity decreases. It is shown that the best adhesion strength is obtained at the special value of the spraying distance.

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Experimental Study on the Thermal Argon Plasma Generation and Jet Length Change Characteristics at Atmospheric Pressure

Cited by 35 publications

References 12 publications

Comparison of Laminar and Turbulent Thermal Plasma Jet Characteristics—A Modeling Study

Comparison of Laminar and Turbulent Thermal Plasma Jet Characteristics—A Modeling Study

Energy Fluctuations in a Direct Current Plasma Torch with Inter-Electrode Inserts Operated at Reduced Pressure

The investigation of the microstructure behavior of the spray distances and argon gas flow rates effects on the aluminum coating using self-generated atmospheric plasma spray system

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