Particle-laden turbulent flows are ubiquitous in nature, laboratories, and modern industry: examples include the transport of aerosols and pollutants in the atmosphere, the advection of rain drops in clouds, the movement of swarms of micro-organisms like phytoplankton in the oceans, and fluid flows with colloids or polymer additives in laboratories or industries. It behooves us, therefore, to develop a detailed understanding of the physics of particle transport in turbulent flows. Research in this area has been growing apace on all fronts - experimental, computational, and theoretical. In particular, the transport, coalescence, and coagulation of particles, advected by a turbulent flows, has attracted the attention of several groups. In addition to the complexity that arises from the turbulence of advecting flows, we have to confront the multiscale nature of particle-fluid interactions, for particle sizes can range from nanometre to centimetre scales; and these particles can often cha...
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