Extinguishing class B fires with dry chemicals: Scaling studies

Autor:	J. Thomas Hughes, Homer W. Cathart, Charles W. Siegmann, Francis R. Faith, James B. Romans, Ralph J. Ouellette, Curtis T. Ewing
Rok vydání:	1995
Předmět:	Heptane Materials science Environmental engineering Extinguishment Poison control Mechanics chemistry.chemical_compound chemistry Drag Heat transfer General Materials Science Particle size Diffusion (business) Safety Risk Reliability and Quality Scaling
Zdroj:	Fire Technology. 31:17-43
ISSN:	1572-8099 0015-2684
DOI:	10.1007/bf01305266
Popis:	In a continuing study of flame extinguishment,1,2,3,4 we report on scaling studies for dry chemicals on larger heptane diffusion flames (0.29 m2 and 2.32 m2 pans). We demonstrate again that small particle sizes extinguish most effectively. Extinguishment is related to heat absorption by decomposing or vaporizing particles. We show that the limiting particle size for each dry chemical—that is, the maximum size which completely decomposes or vaporizes in the flame—is independent of flame size for the systems studied. We broaden and apply the concept of latent or maximum effectiveness2,3 to pan fires of all sizes. Finally, we describe and characterize an aerodynamic effect in the transport of powders, where large particles with their higher momentum entrain and drag smaller, more effective particles into the flame.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::979d94f2ac533b2551800b40c8fde4d7 https://doi.org/10.1007/bf01305266 Zobrazit plný text záznamu Full text from SpringerLink