Volume of Flammable Mixture Resulting from the Atmospheric Dispersion of a Leak or Spill.
Burgess-DS; Murphy-JN; Zabetakis-MG; Perlee-HE
15th Int'l Symposium on Combustion Combustion Inst Pittsburgh, Pennsylvania, PP 289-303 :15 pages
The investigators of an unconfined gas explosion typically derive some measure of the air blast, leading to the assignment of a "tnt equivalent." This number is invariably small, ranging from 0 to 15 pct of the yield that one would have predicted from the heat of combustion of the fuel. The probable reason for this low value, as this paper seeks to show, is that only a small fraction of an atmospherically dispersed gas mixture can be within a flammable range of concentrations. Calculations are presented of the volumes of vapor-air mixture within surfaces of equal concentration. From these figures, it is evident that most of the flammable vapor is quickly dispersed to concentrations below the lower limit of flammability.
15th Int'l. Symposium on Combustion, Combustion Inst., Pgh., Pennsylvania, PP. 289-303