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|Author(s):||Anthony P. Hamins; G. Gmurczyk; William L. Grosshandler; R. G. Rehwoldt; I Vazquez; Thomas G. Cleary; Cary Presser; K Seshadri;|
|Title:||Flame Suppression Effectiveness (NIST SP 861)|
|Published:||April 01, 1994|
|Abstract:||A flame will be extinguished when the time required for the chain reaction which sustains combustion exceeds the time it takes to replenish the necessary heat and reactants. A characteristic time for reaction can be estimated from the inverse of a global kinetic rate coefficient expressed in Arrhenius form as [equation] where B is a molecular collision frequency factor, Eo is a global activation energy, R is the ideal gas constant, and T is the gas temperature. Assuming reactant species and heat are transported at about the same rate (i.e., unity Lewis number), a characteristic time for replenishing both can be estimated from a convective flow velocity and a length scale by [equation].|
|Citation:||Special Publication (NIST SP) - 861|
|Keywords:||halons, fire suppression, effectiveness, diffusion flames, turbulent flames, premixed flames, detonation, chain reactions|
|Research Areas:||Building and Fire Research|
|PDF version:||Click here to retrieve PDF version of paper (5MB)|