Abstract
Abstract. The phenomenon of “cloud voids”, i.e., elongated volumes inside a
cloud that are devoid of droplets, was observed with laser sheet photography
in clouds at a mountain-top station. Two experimental cases, similar in
turbulence conditions yet with diverse droplet size distributions and cloud
void prevalence, are reported. A theoretical explanation is proposed based on
the study of heavy inertial sedimenting particles inside a Burgers vortex. A
general conclusion regarding void appearance is drawn from theoretical
analysis. Numerical simulations of polydisperse droplet motion with realistic
vortex parameters and Mie scattering visual effects accounted for can explain
the presence of voids with sizes similar to that of the observed ones.
Clustering and segregation effects in a vortex tube are discussed for
reasonable cloud conditions.
Funder
Deutsche Forschungsgemeinschaft
European Cooperation in Science and Technology
National Science Foundation
Cited by
8 articles.
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