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We investigate mass transfer during absorption of atmospheric trace solublegases by a single droplet whose size is comparable to the molecular mean freepath in air at normal conditions. It is assumed that the trace reactantdiffuses to the droplet surface and then reacts with the substances inside thedroplet according to the first order rate law. Our analysis applies aflux-matching theory of transport processes in gases and assumes constantthermophysical properties of the gases and liquids. We derive an integralequation of Volterra type for the transient molecular flux density to a liquiddroplet and solve it numerically. Numerical calculations are performed forabsorption of sulfur dioxide (SO2), dinitrogen trioxide (N2O3) and chlorine(Cl2) by liquid nanoaerosols accompanied by chemical dissociation reaction. Itis shown that during gas absorption by nanoaerosols the kinetic effects playsignificant role, and neglecting kinetic effects leads to significantoverestimation of the soluble gas flux into a droplet during all the period ofgas absorption.

Absorption of Soluble Gases by Atmospheric Nanoaerosols