Droplets condensation in turbulent warm clouds (Comunicazione a convegno)

Type
Label
  • Droplets condensation in turbulent warm clouds (Comunicazione a convegno) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • A. Lanotte(1), A. Celani(2), A. Mazzino(3), A. Seminara(2) and F. Toschi(4) (2006)
    Droplets condensation in turbulent warm clouds
    in European Geoscience Union, Vienna, 02-07/04/2006
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A. Lanotte(1), A. Celani(2), A. Mazzino(3), A. Seminara(2) and F. Toschi(4) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) CNR-ISAC, Lecce, Italy, (2) CNRS-INLN, Valbonne, France, (3) Dip. Fisica, Universita' degli Studi di Genova, Italy, (4) CNR-IAC, Roma, Italy (literal)
Titolo
  • Droplets condensation in turbulent warm clouds (literal)
Abstract
  • Microdroplets growth by condensation/evaporation is a question of paramount im- portance to understand warm clouds formation. We consider the problem of droplet growth by condensation in a turbulent flow of nearly saturated vapour both from a theoretical and numerical point of view. Water droplets are inertial particles, subject to gravity, transported by a turbulent flow, and whose size depends on the saturated vapour turbulent fluctuations present in the flow. Feeedback of the droplets conden- sation/evaporation on the vapour field is also taken into account. By means of high resolution 3D direct numerical simulations of a warm cloud, we show how the pres- ence of an underlying turbulent velocity field induces a correlation between droplet trajectories and supersaturation. This leads both to the enhancement of the droplet growth rate and to a fast spreading of the droplet size distribution. We conclude that the enlargement of droplet size spectrum crucially depends on the turbulent fluctua- tions that droplets experience along their lagrangian motion. (literal)
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