Experimental evidence of the rear capture of aerosol particles by raindrops

Abstract : This article presents new measurements of the efficiency with which aerosol particles of accumulation mode size are collected by a 1.25mm sized raindrop. These laboratory measurements provide the link to reconcile the scavenging coefficients obtained from theoretical approaches with those from experimental studies. We provide here experimental proof of the rear capture mechanism in the flow around drops, which has a fundamental effect on submicroscopic particles. These experiments thus confirm the efficiencies theoretically simulated by Beard (1974). Finally, we propose a semi-analytical expression to take into account this essential mechanism to calculate the collection efficiency for drops within the rain size range.
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Atmospheric Chemistry and Physics, European Geosciences Union, 2017, 17 (6), pp.4159--4176. 〈10.5194/acp-17-4159-2017〉
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https://hal.archives-ouvertes.fr/hal-01611152
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Soumis le : jeudi 5 octobre 2017 - 15:34:28
Dernière modification le : mardi 5 juin 2018 - 10:14:20

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Pascal Lemaitre, Arnaud Quérel, Marie Monier, Thibault Menard, Emmanuel Porcheron, et al.. Experimental evidence of the rear capture of aerosol particles by raindrops. Atmospheric Chemistry and Physics, European Geosciences Union, 2017, 17 (6), pp.4159--4176. 〈10.5194/acp-17-4159-2017〉. 〈hal-01611152〉

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