Abstract
Deposition rates of aerosol particles onto pipe walls under turbulent flow conditions were measured. Dioctyl phthalate (DOP) aerosols of six different sizes ranging from 0.035 to 1.3 μm were used in air flows whose Reynolds numbers were controlled at selected values between 1800 and 15,600. The turbulent inertial impaction, transition, and turbulent diffusion regimes were covered. The measured results show that the theory by Wells and Chamberlain (1967, Brit. J. appl. Phys. 19, 1793) predicts deposition by diffusion in turbulent flows reasonably well, while the theory of Friedlander and Johnstone (1957, Ind. Engr. Chem. 49, 1151) is suitable for correlating the data for deposition by inertial impaction. However, these theories alone were not satisfactory for estimating deposition rates in the neighborhood of the minimum aerosol deposition regime where both Brownian diffusional and inertial deposition mechanisms operate simultaneously.
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