An atmospheric pressure nonequilibrium argon/oxygen plasma jet assisted by thepreionization of syringe needle electrode discharge is reported. With the syringe needle plasmaas its pre-ionization source, the hybrid barrier-jet was shown to generate uniform discharge witha lower breakdown voltage and a relatively low gas temperature varying from 390 K to 440 K,even when the vol.% oxygen in argon was up to 6%. Utilizing the actinometry method, theconcentration of atomic oxygen was estimated to be about in an orders of magnitude of 10^(17) cm^(-3).The argon/oxygen plasma jet was then employed to clean out heat transfer oil, with a maximumcleaning rate of 0.1 mm/s achieved.
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