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Determination of explosion behaviour of nano powders with modified 20-L-sphere test

  • This paper describes a modified experimental setup for the test apparatus 20-L-Sphere (also known as 20-L Siwek Chamber), that enables the test samples to be kept under inert atmospheric conditions nearly until ignition. This setup was designed to allow the determination of safety characteristics of nano powders under most critical circumstances (e.g. minimisation of the influence of oxidation before the test itself). The aim of this modification was to determine, whether or not the current setup and procedures underestimate the explosion violence and ignitability of nano powders. For this purpose, two different methods, the so called inerting method and the modified method (using a special nozzle called mushroom nozzle) are used. Both methods are described in the paper. The work includes experimental results of micrometer dusts to validate the modified method. Moreover first results of nanometer iron and aluminium dusts are presented, which were kept at inert conditions until shortlyThis paper describes a modified experimental setup for the test apparatus 20-L-Sphere (also known as 20-L Siwek Chamber), that enables the test samples to be kept under inert atmospheric conditions nearly until ignition. This setup was designed to allow the determination of safety characteristics of nano powders under most critical circumstances (e.g. minimisation of the influence of oxidation before the test itself). The aim of this modification was to determine, whether or not the current setup and procedures underestimate the explosion violence and ignitability of nano powders. For this purpose, two different methods, the so called inerting method and the modified method (using a special nozzle called mushroom nozzle) are used. Both methods are described in the paper. The work includes experimental results of micrometer dusts to validate the modified method. Moreover first results of nanometer iron and aluminium dusts are presented, which were kept at inert conditions until shortly before the ignition. The tested nano iron was found to react pyrophoric, as soon as it gets in contact with air, while the tested nano aluminium did not generally show such behaviour. Tests with nano aluminium using the inerting method revealed a higher pressure rise in comparison to the standard test procedure. This could suggest a different extent of passivation. To investigate this effect more closely, further testes with more nano powders are required.zeige mehrzeige weniger

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Metadaten
Autor*innen:Arne Krietsch, C. Gothe, Marc Scheid, U. Krause
Persönliche Herausgeber*innen:G. Makhviladze, V. Molkov, D. Bradley, P. Sunderland, F. Tamanini
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):ISFEH7 - 7th International seminar on fire & explosion hazards (Proceedings)
Jahr der Erstveröffentlichung:2013
Herausgeber (Institution):University of Maryland
Verlag:Research publishing
Erste Seite:801
Letzte Seite:809
Freie Schlagwörter:Dust explosion; Nano material; Nanopowder; Safety characteristics
Veranstaltung:ISFEH7 - 7th International seminar on fire & explosion hazards
Veranstaltungsort:Providence, RI, USA
Beginndatum der Veranstaltung:05.05.2013
Enddatum der Veranstaltung:10.05.2013
DOI:10.3850/978-981-07-5936-0_13-03
ISBN:978-981-07-5936-0
ISBN:978-981-07-5940-7
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein
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