On the Sensitivity of the Maximum Explosion Pressure of a Dust Deflagration to Turbulence

Abstract

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A Review of the Fire and Explosion Hazards of Particulates

“…We caution, however, that even P max , which theoretically is a chemical thermodynamic entity and thus invariant, can depend strongly on how it is measured (e.g. degree of turbulence) 95) . The reason is that at higher heat loss, maximum temperatures are lower, resulting in slower kinetics, which in turn hampers reaching the equilibrium reaction product composition and thus the adiabatic flame temperature.…”

Determination of the maximum effective burning velocity of dust–air mixtures in constant volume combustion

“…It is well known that both the design of the dust dispersion system, and the ignition delay time used, influence the explosion development in closed vessels significantly (Dahoe, Cant et al, 2001;Dahoe, van der Nat et al, 2001;Pu, 1987). Pu et al developed dust dispersion systems with single and double rows of small jets producing small-scale turbulence (Pu, 1987;Pu et al, 2000;Pu et al, 1993;Yan & Pu, 1999).…”

“…Dispersion systems are required for generating dust suspensions inside closed explosion vessels, and it is wellknown that the dispersion process is characterized by highly transient flow (Dahoe, Cant, & Scarlett, 2001;Dahoe, van der Nat, Braithwaite, & Scarlett, 2001;Dahoe, Zavenbergen, Lemkowitz, & Scarlett, 1996;Pu, Li, Kauffman, & Bernal, 1989). Since the decay of dispersioninduced turbulence is accompanied by deterioration in the actual dust concentration and agglomeration of dispersed particles, the maximum explosion pressure and maximum rate of pressure rise are not functions of turbulence alone.…”

“…A statistical method based on the ensemble average principle was adopted by Pu et al (1989) in determining turbulence parameters for the dispersioninduced non-stationary flow in closed combustion vessels. More recent contributions include the ones by Dahoe et al (1996), Dahoe, Cant et al (2001), and Dahoe, van der Nat et al (2001).…”

Analysis of the flammability properties of solid fuels

“…Pmax of a dust-air mixture is sensitive to flow properties. When the effect of turbulence is not taken into account, the theoretical approach may lead to underestimations or over estimations of the design strength of industrial equipment [72].…”