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<p>Atmospheric Pressure Plasma Jet (APPJ) accelerating following the fluid flow is responsible for the modification of the gas flow dynamics. This study investigates the gas flow dynamics in the presence of non-thermal atmospheric pressure plasma jets (APPJs), focusing on the Greek letter lambda shape transition region between laminar and vortex flow regimes. Using Schlieren imaging, we analyzed flow characteristics at different gas flow rates (2 slm, 3 slm, and 4 slm), identified distinct flow regions and the onset of vortex. A small to moderate flow instability around plasma jet is observed. Key parameters, including Reynolds number, electron density, electron drift velocity (~10<sup>5</sup> m/s) and electrohydrodynamic (EHD) forces, are evaluated experimentally to understand their roles in flow instability. Electron and gas temperature estimated from emission data are ~3500 K and ~350 K, respectively. The plasma jet extends past the 50% air admixture on the helium channel, resulting in a lambda-shaped flow. Additionally, variations in the electric field contribute to the instability of the plasma jet is justified.</p>

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Generation of Lambda Shaped Flow Region in Laminar Gas Jet Induced by Plasma Propagation

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Asma Begum,
  • Tatsuo Ishijima,
  • M. R. Pervez,
  • Mohammed Anwer

摘要

Atmospheric Pressure Plasma Jet (APPJ) accelerating following the fluid flow is responsible for the modification of the gas flow dynamics. This study investigates the gas flow dynamics in the presence of non-thermal atmospheric pressure plasma jets (APPJs), focusing on the Greek letter lambda shape transition region between laminar and vortex flow regimes. Using Schlieren imaging, we analyzed flow characteristics at different gas flow rates (2 slm, 3 slm, and 4 slm), identified distinct flow regions and the onset of vortex. A small to moderate flow instability around plasma jet is observed. Key parameters, including Reynolds number, electron density, electron drift velocity (~105 m/s) and electrohydrodynamic (EHD) forces, are evaluated experimentally to understand their roles in flow instability. Electron and gas temperature estimated from emission data are ~3500 K and ~350 K, respectively. The plasma jet extends past the 50% air admixture on the helium channel, resulting in a lambda-shaped flow. Additionally, variations in the electric field contribute to the instability of the plasma jet is justified.