Study the effect of plasma jet on the gas dynamic at the jet-substrate contact surface

In this work, feed gas modification by plasma jet is visualized by Schirlen imaging and the spreading of the plasma is observed by digital imaging and by Optical Emission Spectroscopy (OES). It has been shown that the long and short lived excited species and ions strongly modify the gas propagation and the spreading pattern of the plasma on the contact surface. Electro hydrodynamic momentum established in the plasma due to the effective applied voltage in the feed gas enhance the surrounding air induces in to the gas channel. It has a great importance in the biomedical application and in the surface treatment. The spreading of the plasma jet on agar gel, metal and teflon is observed and the quasi uniform plasma species distribution on the target surface is identified. Intensity of excited nitrogen and OH is higher than the other species present on the target surface. The turbulence is higher at the outer radius of the plasma contact area and also for higher operating voltage.