| Zugriffsnummer | 44700 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Simulation of the flow of an explosive atmosphere exposed to a hot hemisphere |
| Autor(in); Institution |
Velagala, Subrahmanyeswara; 3.5, Explosionsschutz in der Energietechnik, PTB-Braunschweig
Raval, Priyank; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Chowhan, Sai Charan Singh; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Esmaeelzade, Ghazaleh; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Beyer, Michael; 3.7, Grundlagen des Explosionsschutzes, PTB-Braunschweig
Großhans, Holger; 3.5, Explosionsschutz in der Energietechnik, PTB-Braunschweig
|
| Quelle/Jahr | 13th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions (ISHPMIE):(2020), 970 - 977 |
| Herausgeber(in) |
Physikalisch-Technische Bundesanstalt
|
| DOI | |
| Konferenzangaben | 13th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions (ISHPMIE), Virtual Conference, 27-31, July, 2020 |
| Zusammenfassung | The accidental ignition of combustible atmospheres by hot surfaces is of great concern for the safety of industrial processes. In this paper, we present our research regarding the evolution of thermal plumes originating from hot hemispheres. In particular, we focus on the effect of the orientation of the surface on the ignition process. The auto-ignition temperatures and ignition locations were studied experimentally. To get further insight, we conducted detailed numerical simulations and validated our model with measurements. Three dimensional simulations were performed for hemispheres of orientations ranging from 0 ◦ to 180 ◦ . The solver employs a transient, implicit scheme which is based on the coupled heat transfer and flow equations. The mesh in the vicinity of the hot surfaces is refined to resolve the steep temperature gradients and to capture the boundary layer separation. The influence of the orientation on critical hot spots in the gas mixture is analyzed by examining the flow structures and the temperature evolution of the buoyancy-driven flow. Using the obtained results, we discuss the change of the onset and location of the ignition. |
| Kostenfreier Zugang | Freier Zugang |
| Rechteinformation | CC BY-ND 4.0 ; Creative Commons Attribution NoDerivatives 4.0 License |
| Themenbereich der Metrologie | Physikalische Sicherheitstechnik, Explosionsschutz |
Zitierung
Velagala, S., Raval, P., Chowhan, S. C. S., Esmaeelzade, G., Beyer, M., & Großhans, H. (2020). Simulation of the flow of an explosive atmosphere exposed to a hot hemisphere. 13th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions (ISHPMIE), Virtual Conference, 27-31, July, 2020. https://doi.org/10.7795/810.20200724