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Coupling boundary condition for high-intensity electric arc attached on a non-homogeneous refractory cathode
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0002-7897-621X
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0003-2535-8132
Chalmers University of Technology, 412 96 Gothenburg, Sweden. (Department of Mechanics and Maritime Sciences)
University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 10 000 Zagreb, Croatia.
2018 (English)In: Computer Physics Communications, ISSN 0010-4655, Vol. 222, p. 31-45Article in journal (Refereed) Published
Abstract [en]

The boundarycoupling high-intensity electricarc and refractory cathode is characterized bythree sub- layers: the cathode sheath,the Knudsen layerand the pre-sheath. A self-consistent coupling boundarycondition accounting for these three sub-layers is presented; its novel propertyis to take into account a non-uniform distribution of electronemitters on the surface of the refractory cathode. This non- uniformity is due to cathode non-homogeneity induced by arcing.The computational model is appliedto a one-dimensional test case to evaluate the validity of different modelingassumptions. It is also applied coupling a thoriated tungstencathode with an argon plasma(assumed to be in local thermal equilibrium) to compare the calculation results with uniform and non-uniform distribution of the electron emitters to experimental measurements. The resultsshow that the non-uniformity of the electronemitters’ distribution has a significant effect on the calculated properties. It leads to good agreementwith the cathode surfacetemperature, and with the plasmatemperature in the hottest region.Some differences are observedin colder plasmaregions, where deviation from local thermalequilibrium is known to occur.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 222, p. 31-45
Keywords [en]
Coupling boundary, Thermal plasma, Refractory cathode layer, Gas tungsten arc
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-11812DOI: 10.1016/j.cpc.2017.09.010ISI: 000418969900003Scopus ID: 2-s2.0-85031753829OAI: oai:DiVA.org:hv-11812DiVA, id: diva2:1158600
Available from: 2017-11-20 Created: 2017-11-20 Last updated: 2018-05-17Bibliographically approved

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Javidi Shirvan, AlirezaChoquet, Isabelle

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