Abstract
Simple argon atmospheric pressure cold plasma jet has been designed and characterized. The spectral and electrical characteristics of the generated plasma jet were investigated. The effects of applied voltage and flow rate on plasma jet length were studied. A sinusoidal high voltage waveform was applied to ignite the plasma jet. Two current pulses were generated per each half cycle of the positive applied voltage while one current pulse was generated in the negative halves of the voltage waveforms. The time interval between the two positive current pulses decreased with increasing the applied voltage. The emission spectra of the plasma specified that the plasma included active species of O• and OH•. In addition, the estimated gas temperature of the generated plasma jet was in the range of 330 K, which nominated this jet to be used to treat heat sensitive materials. The obtained results showed that the length of the plasma jet increased by increasing any of the applied voltage or the flow rate at low values, whereas the length approached steady-state values at higher applied voltages and transient from laminar to turbulent flow mode at higher flow rates. This work is highly useful for applications of the required exposure to active species, charged ions, and UV photons at low operating temperatures and applied voltages.
Highlights
Plasma is the fourth state of matter that represents about 99% of the universe and exhibits unique characteristics such as being a quasi-neutral gas with collective behavior.1 It includes simultaneously electrons, ions, neutral atoms/molecules and reactive species
The effects of the argon gas flow rate and the applied voltage variations on the generated plasma jet formation were investigated by studying plasma jet images as shown in Figs. 4 and 5, respectively
The temperature was measured at 2 mm below the jet nozzle and flow rate of 1.67 slpm at 3.5 kV and frequency 27.2 kHz
Summary
Plasma is the fourth state of matter that represents about 99% of the universe and exhibits unique characteristics such as being a quasi-neutral gas with collective behavior. It includes simultaneously electrons, ions, neutral atoms/molecules and reactive species. Plasma is the fourth state of matter that represents about 99% of the universe and exhibits unique characteristics such as being a quasi-neutral gas with collective behavior.1 It includes simultaneously electrons, ions, neutral atoms/molecules and reactive species. The parameters that affect the generation of atmospheric cold plasma such as the applied voltage and the used gas can be controlled in addition to the low cost and flexibility to be used in different applications.. The controllability of operating parameters such as, applied voltage and frequency as well as different types of gases and power sources can be used which gives a wide range of applications.. Cold atmospheric pressure plasma jet (CAPPJ) can be operated using different types of gases such as; the noble gas plasma jet, N2 plasma jet and air. This study can be nominated for the generated plasma jet to be used for treating heat sensitive materials
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