Effect of evaporation and condensation on droplet size distribution in turbulence

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Abstract

The interaction of droplets that undergo phase transition with a turbulent flow is encountered in many areas of engineering and atmospheric science as described in (Lanotte et al., 2008). In the context of cloud physics the evaporation and condensation of water vapor from and to the droplets is the governing process for the growth of the droplets from sub micron size up to a size of around 20 µm, after which they grow mostly by coalescence until they become large enough to fall as rain drops under gravity. Much pioneering work has been done in (Luo et al., 2008; Lanotte et al., 2008; Sidin et al., 2009) on the theoretical and numerical investigation of the influence of turbulence on evaporation and condensation associated with aerosol droplets. In this paper we consider the situation of water droplets undergoing phase change and moving in air. Air also advects the vapor concentration field. We compute the natural size distribution of the droplets that arises as a result of the interaction between the droplets and the transporting turbulent flow. We assume the turbulent flow to be homogeneous and isotropic. We will perform DNS of the velocity field and the passively advected vapor and temperature field. The droplet trajectories are computed time-accurately in a domain with periodic boundary conditions
Original languageEnglish
Title of host publicationProceedings of Direct and Large-Eddy Simulation VIII, July 7-9, 2011, Eindhoven, The Netherlands
EditorsH. Kuerten, B. Geurts, V. Armenio, J. Fröhlich
Place of PublicationBerlin
PublisherSpringer
Pages201-206
ISBN (Print)978-94-007-2482-2
DOIs
Publication statusPublished - 2011
Event8th ERCOFTAC Workshop on Direct and Large-Eddy Simulation (DLES8) - Eindhoven, Netherlands
Duration: 7 Jul 20109 Jul 2010

Workshop

Workshop8th ERCOFTAC Workshop on Direct and Large-Eddy Simulation (DLES8)
Abbreviated titleDLES8
CountryNetherlands
CityEindhoven
Period7/07/109/07/10

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