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- Li, Xiang-YungKTH,Nordic Institute for Theoretical Physics NORDITA (author)
Effect of turbulence on collisional growth of cloud droplets
- Article/chapterEnglish2018
Publisher, publication year, extent ...
- American Meteorological Society,2018
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:kth-246566
- https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-246566URI
- https://doi.org/10.1175/JAS-D-18-0081.1DOI
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-158534URI
Supplementary language notes
- Language:English
- Summary in:English
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- QC 20220323
- Weinvestigate the effect of turbulence on the collisional growth of micrometer-sized droplets through highresolution 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 ε, but only weakly on the Reynolds number. This can be explained through the « 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 ε1/2 even when coalescence is invoked. The size distribution exhibits power-law behavior with a slope of 23.7 from a maximum at approximately 10 up to about 40 mm. 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.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Meteorologi och atmosfärforskning hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Meteorology and Atmospheric Sciences hsv//eng
- NATURVETENSKAP Geovetenskap och miljövetenskap Klimatforskning hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Climate Research hsv//eng
- Clouds
- Turbulence
- Coalescence
- Drops
- Energy dissipation
- Reynolds number
- Size distribution
- Collision and coalescence
- Droplet dynamics
- Droplet size distributions
- High-resolution numerical simulation
- Kolmogorov scale
- Monodisperse droplets
- Power-law behavior
- Turbulent energy dissipation rate
- cloud droplet
- cloud microphysics
- computer simulation
- numerical model
- power law
- atmosfärvetenskap och oceanografi
Added entries (persons, corporate bodies, meetings, titles ...)
- Brandenburg, AxelStockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),Institutionen för astronomi,University of Colorado, USA(Swepub:su)brandenb (author)
- Svensson, GunillaStockholms universitet,Meteorologiska institutionen (MISU),Swedish e-Science Research Centre, Sweden; Global & Climate Dynamics, National Center for Atmospheric Research, USA(Swepub:su)gsven (author)
- Haugen, N. E. L. (author)
- Mehlig, B. (author)
- Rogachevskii, lgorKTH,Nordic Institute for Theoretical Physics NORDITA(Swepub:kth)u1d6noho (author)
- Li, Xiang-YuStockholms universitet,Meteorologiska institutionen (MISU),Nordiska institutet för teoretisk fysik (Nordita),Swedish e-Science Research Centre, Sweden; University of Colorado, USA(Swepub:su)xili (author)
- KTHNordic Institute for Theoretical Physics NORDITA (creator_code:org_t)
Related titles
- In:Journal of the Atmospheric Sciences: American Meteorological Society75:10, s. 3469-34870022-49281520-0469
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