Abstract
Abstract Collisions between small precipitation drops in free fall were analyzed for sizes applicable to self-collection, the process that controls the spreading of precipitation drops to larger sizes. Results from 45 laboratory experiments were generalized using dimensionless parameters to scale the coalescence efficiency, for the temporary coalescence probability, and the satellite occurrence frequency. The coalescence efficiency for uncharged drops (ϵ0) was found to be highly correlated (ρ = 0.99) with a simple combination of factors that scale the tendency for colliding drops to bounce apart as a function of the Weber number (We) and size ratio (p). Charge-induced coalescence was scaled by the electric field between the drops, assuming charged conducting spheres. The coalescence efficiency was obtained as a function of the normalized charge using a semiempirical formula (ρ = 0.95) for the amount of charge required to eliminate bounce and temporary coalescence. The occurrence of temporary coalescence i...
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