Characterization of a spray torch and analysis of process parameters

Ramasamy, R.; Selvarajan, V.

doi:10.1051/epjap:1999202

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…The higher plasma temperature means its electrical conductivity ascending and this will results in a corresponding decrease in arc voltage. The previous experimental measurements have validated that the increasing mixing of air/nitrogen may significantly heighten the argon arc voltage 30) and correspondingly, the pure argon arc voltage is only about 14.5 V as shown in this figure, which is also much lower than that obtained with the mixing. Thus in turn, the descending quantity of the air indraft decreases the arc voltage.…”

Section: Resultssupporting

confidence: 64%

Modeling of Magnetron Argon Plasma Issuing into Ambient Air

Lincun¹,

Xia²

2008

jjap

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A mathematical model is presented to describe the heat transfer and fluid flow in a magnetron plasma torch, by means of a commercial computational fluid dynamics (CFD) code fluent. Specific calculations are presented for a gas-mixing system (i.e., an argon plasma discharging into an air environment), operating in a laminar mode. Numerical results show that an external axial magnetic field (AMF) may have a significant effect on the behavior of an arc plasma, i.e., the AMF will impel the plasma to retract axially and expand radially. In addition, the use of an AMF induces a strong air indraft at the torch spout, and the air mixing with the argon gas results in a marked increase in arc voltage. An increment in the amount of the oncoming argon gas restrains the quantity of the air indraft, and this should be responsible for a lower arc voltage in such an AMF torch when a larger gas inflow is used.

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Section: Resultssupporting

confidence: 64%

Modeling of Magnetron Argon Plasma Issuing into Ambient Air

Lincun¹,

Xia²

2008

jjap

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“…The CVC and TC of the PG investigated show a decreasing trend and they are described by equations (19) and (11). The intensity of gas injection into the reaction arc zone is evaluated by the factor (G 1 /G) 0.12 .…”

Section: Discussionmentioning

confidence: 99%

“…It became possible to extrapolate dimensionless equations describing physical phenomena in the PG channel to a similar PG or discharge channel. New attempts have been made to establish the CVC and thermal characteristics (TC) at atmospheric and vacuum pressures of different gases, in a series of recent studies [10][11][12][13]. Energy balance in the torch, arc characteristics and plasma flow parameters are the most important subjects in these studies.…”

Section: Introductionmentioning

confidence: 99%

Electric and thermal characteristics of the linear, sectional dc plasma generator

IuS¹,

inskaite

ius

et al. 2004

Plasma Sources Sci. Technol.

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The two-and three-chamber, linear, high voltage (200-300 V) and limited current (120-280 A) plasma generators (PGs) have been designed and manufactured by us for application in surface engineering. The operating and thermal characteristics (TC) of PGs, along with the distribution of w local plasma flow velocity (m s −1 ) w f plasma jet mean velocity (m s −1 ) ρ gas density (kg m −3 ) η PG efficiency σ electrical conductivity ( −1 m −1 )

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“…However, it is important to emphasize that the plasma power level is related to the particle velocity. An increase in working plate power will also increase the plasma velocity, which in turn will increase particle velocity [20]. An increase in the particle velocity will decrease the resident time of HA feedstock in the flame, and as a result, the decomposition of the HA powders will decrease.…”

Section: Phase Analysismentioning

confidence: 99%