Low Reactivity Fuels in BST Method

The Baker-Strehlow-Tang (BST) method uses a low, medium, or high reactivity parameter as part of the flame speed lookup. Reactivity is a function of the laminar burning velocity (LBV) of the fuel. In FACET3D, LBV <= 40 cm/s will be low reactivity and LBV >= 75 cm/s will be high reactivity with values in between being medium reactivity. However, some fuels exhibit low reactivity behavior despite having LBV values above 40 cm/s. These fuels are listed in Woodward's CCPS book "Estimating the Flammable Mass of a Vapor Cloud" and are shown below. FACET3D will (as of 13.5.10) produce a warning if any BST threat references one of these chemicals and the LBV is > 40 cm/s.

Name                        CAS
3-Chloro-1-Propene          107051
Ammonia                     7664417
Bromotrifluoroethylene      598732
Carbon Monoxide             630080
1-Chloro-2,3-EpoxyPropane   106898
Ethanol                     64175
Ethyl Chloride              75003
Methane                     74828
Methanol                    67561
Methyl bromide              74839
Chloromethane               74873
Tetraethyl Lead             78002