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RISMathematical Description of the Shape of Plane Hexagonal Snow Crystals
Publisher: American Meteorological Society
Abstract: Simple mathematical expressions are presented for describing the shapes of some plane hexagonal snow crystals. These expressions provide convenient means for cloud physical calculations and can also serve as a method for ...
Acceleration to Terminal Velocity of Cloud and Raindrops
Publisher: American Meteorological Society
Abstract: A theoretical method is given which allows computing the acceleration to terminal velocity of cloud and raindrops at various levels in the atmosphere. For drops of equivalent radius 800 ?m ≤ a0 ≤ 3500 ?m our theoretical ...
An Experimental Determination of the Efficiency with Which Aerosol Particles are Collected by Water Drops in Subsaturated Air
Publisher: American Meteorological Society
Abstract: Experiments have been carried out to determine the efficiency with which aerosol particles of 0.25 ?m radius are collected due to Brownian diffusion, and due to hydrodynamic, phoretic and electrical effects by water drops ...
A Theoretical Determination of the Efficiency with which Aerosol Particles are Collected by Simple Ice Crystal Plates
Publisher: American Meteorological Society
Abstract: Two theoretical models are presented which allow computing the efficiency with which aerosol particles of radius 0.001 ≤ r ≤ 10 ?m are collected by simple ice crystal plates of radius 50 ≤ ac ≤ 640 ?m, in air of various ...
Electrostatic, Thermal and Vapor Density Fields Surrounding Stationary Columnar Ice Crystals
Publisher: American Meteorological Society
Abstract: Formulas suitable for calculating the electrostatic, temperature, and vapor density fields surrounding stationary columnar ice crystals are derived. Columnar ice crystals are approximated as circular cylinders of finite ...
On the Effect of Electric Charges on the Scavenging of Aerosol Particles by Clouds and Small Raindrops
Publisher: American Meteorological Society
Abstract: A theoretical model is described which determines the efficiency E with which aerosol particles of radius r are collected by water drops of radius a due to the combined action of Brownian diffusion, thermo- and diffusiophoresis ...
An Experimental Test of a Theoretical Model to Determine the Rate at which Freely Falling Water Drops Scavenge SO2 in Air
Publisher: American Meteorological Society
Abstract: An experimental method involving the UCLA Rain Shaft is described. This method allows determining the rate at which SO2 is scavenged from air by freely falling water drops. In the present experiment water drops of radii ...
A Numerical Study of the Effect of Electric Charges on the Efficiency with which Planar Ice Crystals Collect Supercooled Cloud Drops
Publisher: American Meteorological Society
Abstract: A theoretical model is presented which allows determination of the efficiency with which electrically charged, simple planar ice crystals collide with electrically charged supercooled cloud drops. The calculations are ...
A Wind Tunnel Investigation of the Effect of an External, Vertical Electric Field on the Shape of Electrically Uncharged Rain Drops
Publisher: American Meteorological Society
Abstract: Results are presented of a recent wind tunnel experiment in which electrically unchanged water drops of 1000?3000 ?m equivalent radius were freely suspended in the vertical air stream of the UCLA Cloud Tunnel. During their ...