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Coagulation of Fine Aerosols

Nazli Egilmez and C. N. Davies
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 380, No. 1778 (Mar. 8, 1982), pp. 99-118
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/2397073
Page Count: 21
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Coagulation of Fine Aerosols
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Abstract

The coefficient of coagulation in air at 1 atmosphere (≈ 105 Pa) has been measured for particles having mean radii ca. 1.6 and 3.0 nm. Ranges of concentration at constant radius were used so that wall loss could be allowed for. The values obtained were 62 and 113 × 10-10 cm3 particle-1 s-1, respectively, which are 12 and 16 times the values calculated from Fuchs's incorrect β-theory. At atmospheric pressure the coagulation coefficient is given by the classical Smoluchowski-Cunningham-Knudsen-Weber-Millikan expression when Kn < 20. Further reduction of particle size leads to lower values than the classical which rise to a maximum at Kn ≈ 27 and then fall towards the gas kinetic value which is not attainable at atmospheric pressure. The Nolan-Pollak condensation nucleus counter was reliable for particles of radius down to 1.5 nm, below which particles were missed increasingly down to the theoretical limit, 1.36 nm. A size distribution of particles was derived by using this instrument at different overpressures. The particle radii were measured by diffusion and by electron microscopy.

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