Abstract
This chapter covers the microscopic multiscale physics of collision and coagulation processes, mathematical descriptions of collision and coagulation kernels of spherical particles in a turbulent flow, and the macroscopic modeling of the evolution of the particle size distribution in terms of the kinetic collection equation. Specific attention will be given to turbulent coagulation of inertial particles, including discussions on how particle transport by turbulence, preferential concentration, and particle–particle hydrodynamic interactions affect the turbulent coagulation process. A hybrid direct numerical simulation approach is then described in order to quantify the kinematic and dynamic collision statistics, followed by a discussion on theoretical parameterization of collision statistics. The specific application of turbulent coagulation of cloud droplets will be used to illustrate how the microphysics study and the kinetic collection equation are combined to advance our understanding of coagulational growth of particles and its significance in a turbulent particle-laden flow system.
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