Editorial Type:
Article
Article Type:
Research Article

Collisions of Cloud Droplets in a Turbulent Flow. Part V: Application of Detailed Tables of Turbulent Collision Rate Enhancement to Simulation of Droplet Spectra Evolution

M. Pinsky The Hebrew University of Jerusalem, Jerusalem, Israel

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A. Khain The Hebrew University of Jerusalem, Jerusalem, Israel

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H. Krugliak The Hebrew University of Jerusalem, Jerusalem, Israel

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Print Publication:
01 Feb 2008
DOI:
https://doi.org/10.1175/2007JAS2358.1
Page(s):
357–374
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Abstract

The present study is a continuation of the series of studies dedicated to the investigation of cloud droplet collisions in turbulent flow with characteristics that are typical of real clouds. Detailed tables of collision kernels and collision efficiencies calculated in the presence of hydrodynamic interaction of droplets are presented. These tables were calculated for a wide range of turbulent parameters. To illustrate the sensitivity of droplet size distribution (DSD) evolution to the turbulence-induced increase in the collision rate, simulations of DSD evolution are preformed by solving the stochastic kinetic equation for collisions. The results can be applied to cloud modeling. The tables of collision efficiencies and collision kernels are available upon request. Some unsolved problems related to collisions of droplets and ice hydrometeors in turbulent clouds are discussed in the conclusion.

Corresponding author address: Alexander Khain, Department of the Atmospheric Sciences, The Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904, Israel. Email: khain@vms.huji.ac.il

Abstract

The present study is a continuation of the series of studies dedicated to the investigation of cloud droplet collisions in turbulent flow with characteristics that are typical of real clouds. Detailed tables of collision kernels and collision efficiencies calculated in the presence of hydrodynamic interaction of droplets are presented. These tables were calculated for a wide range of turbulent parameters. To illustrate the sensitivity of droplet size distribution (DSD) evolution to the turbulence-induced increase in the collision rate, simulations of DSD evolution are preformed by solving the stochastic kinetic equation for collisions. The results can be applied to cloud modeling. The tables of collision efficiencies and collision kernels are available upon request. Some unsolved problems related to collisions of droplets and ice hydrometeors in turbulent clouds are discussed in the conclusion.

Corresponding author address: Alexander Khain, Department of the Atmospheric Sciences, The Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904, Israel. Email: khain@vms.huji.ac.il

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