Role of Cloud Turbulence in the Formation of Rain
(Alexander Fouxon, Isreal).
Considered particles in flow consisting of a collection of vortices (as heavy particles in a centrifuge hurled into the hyperbolic region between the vortices) Summary: Droplets collision kernel in turbulence was strongly enhanced with respect to mean field estimate due to preferential concentration and the sling effect, both enhanced by intermittency of turbulence with respect to Kolmogorov 1941 estimates. The main missing element in Direct Numerical Simulations (DNS), in need of theoretical study, is turbulent mixing of interacting fields of vapour density, droplet concentration, and vapour temperature.