Droplet_growth

Diffusional growth rate of a cloud droplet by condensation of water vapor. Accounts for vapor-phase diffusion (D_v), the kinetic correction to the diffusivity (D_v'), thermal conductivity of air (k_a and k_a'), and the curvature + solute (Köhler) contributions to the equilibrium saturation ratio S_eq over the droplet surface. Output is the droplet-diameter growth rate dD_p/dt (m/s) from Seinfeld & Pandis (2006) Eq. 17.70. Source: Aerosol.jl@c8c640bb src/cloud_physics.jl:322 (mtk2esm-scaffolded, mdl-43a).