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Buoyancy produced by autocatalytic reaction fronts can produce fluid flowsthat advect the front position, giving rise to interesting feedback betweenchemical and hydrodynamic effects. In a large diameter, extended cylinder thatis relatively free of boundary constraints, localized initiation of aniodate-arsenous acid (IAA) reaction front on the bottom boundary generates arising autocatalytic plume. Such plumes have several differences from theirnon-reactive counterparts. Using numerical simulation, we have found that ifreaction is initiated using a spherical ball of product solution well above thebottom boundary, the subsequent flow can evolve much like an autocatalyticplume: the ball develops a reacting head and tail that is akin to the head andconduit of an autocatalytic plume, except that the tail is disconnected fromthe boundary. In the limit of large initial autocatalytic balls, however,growth of a reacting tail is suppressed and the resemblance to plumesdisappears. Conversely, very small balls of product solution fail to initiatesustained fronts and eventually disappear.

The Heads and Tails of Buoyant Autocatalytic Balls