Toroidal plasmoid generation via extreme hydrodynamic ... …

Toroidal plasmoid generation via extreme hydrodynamic ...

• The study explores a unique case of atmospheric pressure plasma generated at room temperature by a high-speed microjet of deionized water striking a dielectric solid surface, without any external electromagnetic influence.

• Plasma generation is attributed to tribo-electrification, resulting from extreme hydrodynamic shear that produces energetic free electrons.

• The plasma formed has a coherent toroidal structure, likely stabilized by its self-induced electromagnetic field, and is characterized by strong luminescence and the emission of discrete-frequency radio waves.

• This research introduces a new experimental platform for low-temperature plasma science, enhancing the understanding of plasma behavior and properties.

• Important terms related to the study include hydrodynamic shear, luminescence, toroidal plasmoid, tribo-electricity, and water jet.

• The experimental setup utilized high-resolution microscopy to capture luminescent structures and optical emission spectra, revealing different emissions in air and helium environments.

• Computational fluid dynamics simulations were performed to analyze the jet flow and associated strain rates, offering insights into the dynamics of the plasma generation process.

• The study elaborates on the tribo-electric charging mechanism, explaining how negative and positive charges develop during the interaction of the water jet with the dielectric surface, leading to plasma formation and subsequent chemical reactions in the water.