Jan 26Growth velocity of dropletsUse the Köhler equation to find a psatfor the edge of the particle, plug pressure into ideal gas law to obtain concentration csThen use = ∞-crcRpr( ∞-)ccswith ∞cequal to ambient concentration to find concentration at surface of dropletTotal flux to drop: =( ∞-)J4πRpDg ccsdependent on the radius, larger droplets have larger flux.Consider a mass balance: =()MWJρWddt 43πRp3=( ∞-)dRpdtDgMWρpRp ccsGrowth slows as droplet becomes larger. Cannot grow into raindrops by diffusion. At some point, Rpis sufficiently large to reduce dR
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