The combustion of free-flowing droplets of chlorinated benzenes, alkanes, and their mixtures

An experimental study of the free flowing droplet combustion of miscible blends of alkanes with monochlorobenzene, dichlorobenzene, and trichlorobenzene is described. Roughly 500 micron droplets fall through electrically heated air where they ignite and burn. Using high speed video, the size and velocity of the droplets are measured, and this data is reduced to obtain burning rates.;Alkane burning rates are near 0.90 mm;Earlier burning rate results for pure dichlorobenzene and pure trichlorobenzene measured in an H;Diffusion flame theory burning rate predictions overestimate the burning rate in proportion to Cl/H. For Cl/H ;Some chlorinated benzene blends show a very strong sooting tendency, including long soot filaments trailing in the droplet wake. This behavior does not correlate with the burning rate. In blends where the alkane is more volatile, two-stage burning is observed. The first stage depletes the alkane and the second stage is pure chlorinated benzene. No two-stage behavior is seen when the chlorinated benzene is more volatile.