Abstract
The influence of different nozzle head geometries and, therefore, the variation of the excitation and relaxation volume on the energy flux from an atmospheric pressure plasma jet to a surface have been investigated. Measurements have been performed by passive calorimetric probes under variation of the gas flow through the nozzle. The results show that the geometry of the nozzle head has a significant impact on the resulting energy flux. The relaxation volume affects the dependence of the energy flux on the gas flow. While there is no significant influence of the working gas flow on the energy flux without a relaxation volume, utilizing a relaxation volume leads to a decrease of the energy flux with increasing working gas flow. Within the analyzed parameter range, the energy flux reveals for both nozzle heads a linear dependency on the applied primary voltage.
Highlights
Atmospheric pressure plasma treatment has received growing interest in various industrial applications for surface cleaning, activation, functionalization, etching or coating processes during the last decades [1,2,3,4]
20 slm – 50 slm 4 mm – 16 mm Standard setting 400 V 29 slm Results and discussion The results show a linear dependence of the energy flux on the primary voltage and the primary power within the analyzed parameter range for nozzle head A as well as nozzle head B
It was demonstrated that the energy flux onto the treated material from the presented atmospheric pressure plasma jet can be modified by the design of the nozzle head, the amount of working gas and the primary voltage
Summary
Atmospheric pressure plasma treatment has received growing interest in various industrial applications for surface cleaning, activation, functionalization, etching or coating processes during the last decades [1,2,3,4]. The influence of different nozzle head geometries and, the variation of the excitation and relaxation volume on the energy flux from an atmospheric pressure plasma jet to a surface have been investigated. The experiments were focused on the influences of the working gas flow and excitation voltage for two different nozzle head geometries of the jet.
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