Numerically optimized band boundaries of Planck mean absorption coefficients in air plasma

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dc.contributor.authorKloc, Petrcs
dc.contributor.authorAubrecht, Vladimírcs
dc.contributor.authorBartlová, Miladacs
dc.coverage.issue30cs
dc.coverage.volume50cs
dc.date.accessioned2020-08-04T11:00:23Z
dc.date.available2020-08-04T11:00:23Z
dc.date.issued2017-08-02cs
dc.description.abstractRadiation heat transfer plays an important role in the energy balance of plasma in an electric arc and its accurate prediction is essential for the development of new electrical devices. Unfortunately, a very complex spectrum of the absorption coefficient makes accurate radiation heat transfer calculations a very challenging task, especially with complex geometries. Numerical approximation of the absorption coefficient is therefore commonly used to reduce computing demands. This paper presents our contribution to the topic of computing requirements reduction, namely the problem of frequency band selection for mean absorption coefficients (MACs). We show that, with the proper band distribution and averaging method, even a very low number of bands can be sufficient for an accurate approximation of the real radiation heat transfer. The band selection process is based upon numerical optimization with a mean value of each band being calculated as a line limited Planck MAC. Both the line limiting factor and associated characteristic plasma absorption length are investigated in detail and an optimal value equal to the three plasma radii is proposed. Tables for three bands mean absorption coefficients in air at the pressure of 1 bar and temperature range spanning from 300 K to 30 kK are included in this paper. These tables serve as input parameters for a fast evaluation of radiation transfer using either the P1 or discrete ordinates method (DOM) approximation with satisfactory accuracy.en
dc.formattextcs
dc.format.extent1-10cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationJournal of Physics D: Applied Physics. 2017, vol. 50, issue 30, p. 1-10.en
dc.identifier.doi10.1088/1361-6463/aa7627cs
dc.identifier.issn0022-3727cs
dc.identifier.other138852cs
dc.identifier.urihttp://hdl.handle.net/11012/180695
dc.language.isoencs
dc.publisherIOP Publishingcs
dc.relation.ispartofJournal of Physics D: Applied Physicscs
dc.relation.urihttp://iopscience.iop.org/article/10.1088/1361-6463/aa7627/pdfcs
dc.rightsCreative Commons Attribution 3.0 Unportedcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/0022-3727/cs
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/cs
dc.subjectradiationen
dc.subjectradiative heat transferen
dc.subjectarcen
dc.subjectairen
dc.subjectmean absorption coefficienten
dc.subjectband averageen
dc.subjectnumerical optimizationen
dc.titleNumerically optimized band boundaries of Planck mean absorption coefficients in air plasmaen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-138852en
sync.item.dbtypeVAVen
sync.item.insts2020.08.04 13:00:23en
sync.item.modts2020.08.04 12:26:10en
thesis.grantorVysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií. Ústav výkonové elektrotechniky a elektronikycs
thesis.grantorVysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií. Ústav fyzikycs
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