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- W2770164969 abstract "We investigate the effect of turbulence on the collisional growth of micrometer-sized droplets through high-resolution numerical simulations with well-resolved Kolmogorov scales, assuming a collision and coalescence efficiency of unity. The droplet dynamics and collisions are approximated using a superparticle approach. In the absence of gravity, we show that the time evolution of the shape of the droplet-size distribution due to turbulence-induced collisions depends strongly on the turbulent energy-dissipation rate [Formula: see text], but only weakly on the Reynolds number. This can be explained through the [Formula: see text] dependence of the mean collision rate described by the Saffman–Turner collision model. Consistent with the Saffman–Turner collision model and its extensions, the collision rate increases as [Formula: see text] even when coalescence is invoked. The size distribution exhibits power-law behavior with a slope of −3.7 from a maximum at approximately 10 up to about 40 μm. When gravity is invoked, turbulence is found to dominate the time evolution of an initially monodisperse droplet distribution at early times. At later times, however, gravity takes over and dominates the collisional growth. We find that the formation of large droplets is very sensitive to the turbulent energy dissipation rate. This is because turbulence enhances the collisional growth between similar-sized droplets at the early stage of raindrop formation. The mean collision rate grows exponentially, which is consistent with the theoretical prediction of the continuous collisional growth even when turbulence-generated collisions are invoked. This consistency only reflects the mean effect of turbulence on collisional growth." @default.
- W2770164969 created "2017-12-04" @default.
- W2770164969 creator A5015144100 @default.
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- W2770164969 creator A5074141887 @default.
- W2770164969 creator A5081279840 @default.
- W2770164969 creator A5089968146 @default.
- W2770164969 date "2018-10-01" @default.
- W2770164969 modified "2023-10-12" @default.
- W2770164969 title "Effect of Turbulence on Collisional Growth of Cloud Droplets" @default.
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- W2770164969 doi "https://doi.org/10.1175/jas-d-18-0081.1" @default.
- W2770164969 hasPublicationYear "2018" @default.