| Zugriffsnummer | 34161 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Ignition of dust-air atmospheres by ultrasonic waves |
| Autor(in); Institution |
Simon, Lars Hendrik; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Wilkens, Volker; 1.6, Schall, PTB-Braunschweig
Fedtke, Thomas; 1.6, Schall, PTB-Braunschweig
Beyer, Michael; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
|
| Quelle/Jahr | Journal of Loss Prevention in the Process Industries: 26 (2013), 1583 - 1589 |
| ISSN | 0950-4230 |
| DOI | |
| Verlag | Butterworth: Guildford, Surrey |
| Freie Schlagworte | ignition source ultrasound ; dust explosion ; ultrasonic standing wave field ; Acoustically absorbing material |
| Zusammenfassung | This paper shows the results of our investigations on the ignition source ultrasound in dust-air atmospheres. Ultrasound is, on the one hand, considered to be an ignition source according to international safety standards (EN 1127e1 (2011)). On the other hand, though, ultrasound is used for various applications in gases and air, such as level and flow measurement, or in the process industry, but no explosion accidents have yet been reported. Our research now shows that it is indeed possible to ignite dust-air mixtures in ultrasound fields under certain conditions. We conducted our experiments in an ultrasound standing wave field and used maize starch, calcium stearate and sulfur dust. For ignitions, an absorbing target was needed to convert the acoustic energy into heat. From theoretical estimations and experiments critical conditions that provoke ultrasonically triggered explosions are identified. |
