Thermal pinch effect in the argon d.c. plasma |
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| Affiliation: | 1. Graduate School of Systems Science and Technology, Course of Machine Intelligence and Systems, Akita Prefectural University, Japan;2. Faculty of Systems Science and Technology, Department of Mechanical Engineering, Akita Prefectural University, 84-4 Tsuchiya, Yurihonjo, Akita 015-0055, Japan;1. Empa, Swiss Federal Laboratories for Material Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland;2. ETH Zürich, Institute for Mechanical Systems, Department of Mechanical and Process Engineering, 8092 Zürich, Switzerland;3. Inspire Centre for Mechanical Integrity, c/o Empa, CH-8600 Dübendorf, Switzerland |
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| Abstract: | Creation and consequences of the marked thermal pinch in the analytical d.c. plasma (DCP) are investigated. The flowing plasma constricts due to interaction between forced convective cooling and electric current regulation of the low power arc. Distinctive visual, spectroscopic and operational features of the DCP are associated with the thermal pinch and the transport properties of hot argon. Response of modelled electron density to changes in cooling gas flow rates are compared to experimental data. Implications for non-local thermodynamic equilibrium (LTE) spectrochemical excitation are noted. |
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