Abstract
Abstract Theoretical and experimental studies have been carried out to describe the absorption of sulfur dioxide by moving spheroidal water drops under transient flow conditions. These investigations allow the determination of the rate at which SO2 is scavenged from air by deformed spheroidal freely falling water drops. First, the theoretical models in the case of spheroidal water drops will be presented. For drops smaller than 1 mm in diameter, modeling is based on numerical solutions of Navier–Stokes and convective-diffusion equations, which describe transient flow and concentration fields, respectively, both in liquid and gas phases. For drops larger than 1 mm in diameter, modeling is based on scaling of interfacial agitation taking into account the effect of turbulent mixing and oscillation inside the drops. Second, an experimental device involving a 5-m rain shaft is presented in order to study SO2 absorption and to verify the theoretical models for spheroidal water drops. The predicted sulfur concen...
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