Abstract
Brownian coagulation of ultrafine aerosol particles consisting of two different species has been studied experimentally. In the experiment, high concentration two-component AgNaCl or ZnCl 2NaCl aerosols having one or two peaks were passed through a metal pipe in a laminar state, and the particle size distribution and number concentration at the inlet and the outlet of the coagulation pipe were measured. In the theoretical calculation, the population balance equation for simultaneous Brownian coagulation and diffusive deposition of aerosols was solved numerically introducing Fuchs' formula as the coagulation rate function. The calculation results obtained have been compared with the experimental results, and the effects of the London—van der Waals force and particle density on Brownian coagulation of two-component ultrafine particles have been evaluated in the transition and free molecular regimes for the first time. It was found that the enhancement of the coagulation rate in the AgNaCl aerosol system is larger than that in the ZnCl 2NaCl aerosol system, which was qualitatively explained using coagulation rate functions derived by Fuchs and Marlow.
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