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Schlieren High-Speed Imaging of a Nanosecond Pulsed Atmospheric Pressure Non-equilibrium Plasma Jet

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Abstract

The fluid-dynamic characterization by means of Schlieren high-speed imaging of the effluent region of a single electrode plasma jet is presented. The plasma source is powered by a high-voltage generator producing pulses with nanosecond rise time. Time evolution of fluctuations generated in a free flow regime and when the jet is impinging on substrates of different geometries (plain substrates, Petri dishes, etc.) and materials (metal, dielectric covered metal, polystyrene) has been investigated. Plasma ignition causes fluid-dynamic instabilities moving in the direction of the jet flow and correlated with the high-voltage pulses: for low pulse repetition frequency (PRF) (<125 Hz), the movement of the turbulent front between two voltage pulses can be tracked, whereas for higher PRF (1,000 Hz) the flow is completely characterized by turbulent eddies in the effluent region, without relevant changes between subsequent voltage pulses. When the jet is impinging on a substrate, turbulent fronts propagate over the surface starting from the gas impinging zone.

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Acknowledgments

This work was partially supported by FP7 COST Action MP1101 “Biomedical Applications of Atmospheric Pressure Plasma Technology” and FP7 COST Action TD1208 “Electrical discharges with liquids for future applications”. The contribution of Silvano Dallavalle for the design of the plasma source is acknowledged.

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Authors and Affiliations

  1. Department of Industrial Engineering (DIN), Alma Mater Studiorum-Università di Bologna, Via Saragozza 8, 40123, Bologna, Italy

    V. Colombo, E. Ghedini, M. Gherardi, R. Laurita, A. Liguori, P. Sanibondi & A. Stancampiano

  2. Industrial Research Centre for Advanced Mechanics and Materials (C.I.R.I.-M.A.M.), Alma Mater Studiorum-Università di Bologna, Via Saragozza 8, 40123, Bologna, Italy

    M. Boselli, V. Colombo & E. Ghedini

Authors
  1. M. Boselli
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  2. V. Colombo
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  3. E. Ghedini
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  4. M. Gherardi
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  5. R. Laurita
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  6. A. Liguori
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  7. P. Sanibondi
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  8. A. Stancampiano
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Corresponding author

Correspondence to V. Colombo.

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Boselli, M., Colombo, V., Ghedini, E. et al. Schlieren High-Speed Imaging of a Nanosecond Pulsed Atmospheric Pressure Non-equilibrium Plasma Jet. Plasma Chem Plasma Process 34, 853–869 (2014). https://doi.org/10.1007/s11090-014-9537-1

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  • DOI: https://doi.org/10.1007/s11090-014-9537-1

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