Condensational and Collisional Growth of Cloud Droplets in a Turbulent Environment
نویسندگان
چکیده
منابع مشابه
Growth of Cloud Droplets in a Turbulent Environment
Motivated by the need to resolve the condensation-coalescence bottleneck in warm rain formation, a significant number of studies have emerged in the past 15 years concerning the growth of cloud droplets by water-vapor diffusion and by collision-coalescence in a turbulent environment.With regard to condensation, recent studies suggest that small-scale turbulence alone does not produce a signific...
متن کاملGrowth of Cloud Droplets by Turbulent Collision–Coalescence
An open question in cloud physics is how rain forms in warm cumulus as rapidly as it is sometimes observed. In particular, the growth of cloud droplets across the size gap from 10 to 50 m in radius has not been fully explained. In this paper, the authors investigate the growth of cloud droplets by collision– coalescence, taking into account both the gravitational mechanism and several enhanceme...
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A novel parallel implementation of hybrid DNS (Direct Numerical Simulation) code for simulating collision-coalescence of aerodynamically interacting particles in a turbulent flow has been developed. An important application of this code is to quantify turbulent collisioncoalescence rate of cloud droplets, relevant to warm rain formation, under physically realistic conditions. The code enables p...
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The collision efficiency of sedimenting cloud droplets in a turbulent air flow is a key input parameter in predicting the growth of cloud droplets by collision–coalescence. In this study, turbulent collision efficiency was directly computed, using a hybrid direct numerical simulation (HDNS) approach (Ayala et al 2007 J. Comput. Phys. 225 51–73). The HDNS results show that air turbulence enhance...
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ژورنال
عنوان ژورنال: Journal of the Atmospheric Sciences
سال: 2019
ISSN: 0022-4928,1520-0469
DOI: 10.1175/jas-d-19-0107.1