期刊
JOURNAL OF TURBULENCE
卷 8, 期 17, 页码 1-9出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14685240601105716
关键词
atmospheric turbulence; turbulent convection; direct numerical simulation; two-dimensional turbulence
The evolution of microdroplets transported by a turbulent flow is considered. Droplets surrounded by moist air are able to grow by diffusion of water vapour on their surface. A two-dimensional model of dry Boussinesq thermal convection is considered in which the turbulent velocity field is driven by a temperature gradient. The evolution of the velocity, temperature, vapour fields and of droplet trajectories and radii is analysed by means of high-resolution direct numerical simulations. Despite the fact that the environment becomes drier and drier, a mean growth of droplets is obtained. The mechanism identified is based on the presence of correlations between the vapour field and droplet trajectories. Besides, a spreading of size distribution is observed, with the formation of droplets with very different sizes. Improvements with respect to previous models are discussed.
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