Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 18: Atmospheric Pressure Plasmas and their Applications IV
P 18.7: Talk
Wednesday, February 28, 2024, 18:15–18:30, WW 1: HS
Elucidating heat transfer occurring during the interaction of a helium jet with ambient air — •Bruno Honnorat1, Fellype do Nascimento2, Konstantin Georgiev Kostov2, and Torsten Gerling1,3 — 1ZIK plasmatis, Leibniz Institute for Plasma Science and Technology (INP), 17489 Greifswald, Germany — 2Faculty of Engineering in Guaratinguetá, São Paulo State University-UNESP, Guaratinguetá 12516-410, Brazil — 3Diabetes Competence Centre Karlsburg (KDK), Leibniz Institute for Plasma Science and Technology (INP), 17495 Karlsburg, Germany
One of the simplest experimental setup imaginable, which consist of injecting helium at ambient temperature (Tamb) into air at Tamb, with a flow rate of a few SLM, leads to an extraordinary phenomenon. Without plasma discharge, the gas temperature rises by several degrees Kelvin. The underlying physics of this observation remained unclear. The Dufour effect is a thermodynamic phenomenon where a concentration gradient causes heat transfer. This study quantifies the contribution of the Dufour effect on helium jet temperatures. Order-of-magnitude calculations confirm the relevance of the Dufour effect. 2D-axisymmetrical laminar CFD simulations were done with OpenFOAM for different gas flows and gas composition. A fiber optic sensor was moved in the outstream of the jet to realize a 3D map of the temperature. Beside helium, argon and nitrogen jet temperatures were measured. The results show temperature increase in the center of up to 9.4 K and a radial cooling down by 8.4 K. The confrontation of simulations and experiments shows a good agreement.
Keywords: Dufour effect; Multicomponent diffusion; OpenFOAM; gas jet; temperature measurements