Abstract
The importance of relative velocity past individual drops composing a burning spray with an envelope flame is estimated by applying the Bellan and Cuffel (1983) spray evaporation model to an ambient flow going around the spray without penetrating it. The model assumes a spherical spray composed of monodisperse uniformly distributed droplets which all move at the same speed, and relative gas/spray velocities, and spray radii used were representative of boiler and furnace operations. Numerical calculations indicate that the spray is more prone to ambient flow penetration for leaner mixtures (particularly for n = 1/cu cm), lower initial temperatures of gas phase and droplet, and more dilute spray configurations.
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