Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 17, 4159-4176, 2017
https://doi.org/10.5194/acp-17-4159-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
28 Mar 2017
Experimental evidence of the rear capture of aerosol particles by raindrops
Pascal Lemaitre1, Arnaud Querel2,a, Marie Monier3,4, Thibault Menard5, Emmanuel Porcheron1, and Andrea I. Flossmann3,4 1Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SCA, LPMA, Gif-sur-Yvette, France
2Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PRP-CRI, SESUC, BMCA, Fontenay-aux-Roses, France
3Clermont Université, Université Blaise Pascal, Laboratoire de Météorologie Physique, Clermont-Ferrand, France
4CNRS, INSU, UMR6016, LaMP, Aubière, France
5CNRS UMR6614, CORIA Rouen, Site Universitaire du Madrillet, Saint-Étienne-du-Rouvray, France
acurrently at: Strathom Energie, Paris, France
Abstract. This article presents new measurements of the efficiency with which aerosol particles of accumulation mode size are collected by a 1.25 mm 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.

Citation: Lemaitre, P., Querel, A., Monier, M., Menard, T., Porcheron, E., and Flossmann, A. I.: Experimental evidence of the rear capture of aerosol particles by raindrops, Atmos. Chem. Phys., 17, 4159-4176, https://doi.org/10.5194/acp-17-4159-2017, 2017.
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Short summary
We present new measurements of the efficiency with which aerosol particles are collected by raindrops. These measurements provide the link to reconcile the scavenging coefficients obtained from theoretical approaches with those from experimental studies. We provide proof of the rear capture that is a fundamental effect on submicroscopic particles. Finally, we propose an expression to take into account this mechanism to calculate the collection efficiency for drops within the rain size range.
We present new measurements of the efficiency with which aerosol particles are collected by...
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