| Explosion propagation in inert porous media. | |
| | |
MedLine Citation:
|
PMID: 22213663 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
|
Porous media are often used in flame arresters because of the high surface area to volume ratio that is required for flame quenching. However, if the flame is not quenched, the flow obstruction within the porous media can promote explosion escalation, which is a well-known phenomenon in obstacle-laden channels. There are many parallels between explosion propagation through porous media and obstacle-laden channels. In both cases, the obstructions play a duel role. On the one hand, the obstruction enhances explosion propagation through an early shear-driven turbulence production mechanism and then later by shock-flame interactions that occur from lead shock reflections. On the other hand, the presence of an obstruction can suppress explosion propagation through momentum and heat losses, which both impede the unburned gas flow and extract energy from the expanding combustion products. In obstacle-laden channels, there are well-defined propagation regimes that are easily distinguished by abrupt changes in velocity. In porous media, the propagation regimes are not as distinguishable. In porous media the entire flamefront is affected, and the effects of heat loss, turbulence and compressibility are smoothly blended over most of the propagation velocity range. At low subsonic propagation speeds, heat loss to the porous media dominates, whereas at higher supersonic speeds turbulence and compressibility are important. This blending of the important phenomena results in no clear transition in propagation mechanism that is characterized by an abrupt change in propagation velocity. This is especially true for propagation velocities above the speed of sound where many experiments performed with fuel-air mixtures show a smooth increase in the propagation velocity with mixture reactivity up to the theoretical detonation wave velocity. |
| | |
Authors:
|
G Ciccarelli |
Related Documents
:
|
15285083 - Characterization of single and double fiber-coupled diffusing spheres. 19844473 - Photodarkening in tb(3+)-doped phosphosilicate and germanosilicate optical fibers. 14682833 - Stable equilibrium based on lévy statistics: stochastic collision models approach. |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Philosophical transactions. Series A, Mathematical, physical, and engineering sciences Volume: 370 ISSN: 1364-503X ISO Abbreviation: Philos Trans A Math Phys Eng Sci Publication Date: 2012 Feb |
Date Detail:
|
Created Date: 2012-01-03 Completed Date: 2012-02-15 Revised Date: 2013-04-24 |
Medline Journal Info:
|
Nlm Unique ID: 101133385 Medline TA: Philos Trans A Math Phys Eng Sci Country: England |
Other Details:
|
Languages: eng Pagination: 647-67 Citation Subset: - |
Affiliation:
|
Department of Mechanical and Materials Engineering, Queen's University, Kingston, Ontario, Canada K7L 3N6. ciccarel@me.queensu.ca |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Combustion waves in hydraulically resisted systems.
Next Document: Stability of detonation in a circular pipe with porous walls.