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Droplet growth by gravitational coagulation enhanced by turbulence: Comparison of theory and measurements
Marine Sciences Research Center, Stony Brook University, Stony Brook, New York, USA
Department of Mechanical and Aeronautical Engineering, Department of Civil and Enviromental Engineering, and Department of Land, Air, and Water Resources, University of California, Davis, California, USA
Institute of Atmospheric Physics, Johannes Gutenberg University, Mainz, Germany
While it is well known that cloud droplets grow in an inherently turbulent environment, the role of turbulence is only now being elucidated. To shed light on this issue, we compare published measurements of droplet growth by collision in turbulent flow with numerical simulations. Because the measurements demonstrate an accelerated growth under turbulent conditions compared to laminar ones, the data clearly cannot be reproduced using the well-established kernel for sedimentation under laminar conditions. By employing a collision kernel that has been recently derived from direct numerical simulations, we perform sensitivity studies and quantify the parameter ranges that are compatible with the experimental data. This experiment does not enable us to uniquely determine the model parameters but we were able to place constraints on the form of acceptable models that reproduce the experimental data successfully. Moreover, we gain insight into how laboratory experiments could be improved to aid model validation.
Received 26 June 2006; accepted 29 December 2006; published 7 April 2007.
Citation: (2007), Droplet growth by gravitational coagulation enhanced by turbulence: Comparison of theory and measurements, J. Geophys. Res., 112, D07204, doi:10.1029/2006JD007702.
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