The electrostatic forces on charged ice crystals separated by small distances in an electric field
✍ Scribed by J. Latham; C. P. R. Saunders
- Publisher
- John Wiley and Sons
- Year
- 1970
- Tongue
- English
- Weight
- 387 KB
- Volume
- 96
- Category
- Article
- ISSN
- 0035-9009
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✦ Synopsis
Abstract
Measurements have been made, using a precision balance, of the electrostatic forces exerted on scaled‐up metallic models of cloud droplets and, particularly, ice crystals, as a function of their charges, configurations and proximity to a second model, together with the strength of the electric field E in which they were situated and the angle θ between the direction of the field and the line of centres of the models.
It was found that the electrostatic forces on metallic spheres agreed closely with those calculated from the equation of Davis (1964). The forces on irregularly shaped uncharged metallic models of ice crystals were generally larger than those on spheres of equivalent volume to the crystals by a factor γ which was shown to be independent of E and θ and, in general, extremely insensitive to the separation over the range of conditions studied.
The measured values of γ, together with the values of the equivalent radius R~e~ of a crystal, deduced directly from its volume, were incorporated into a modified form of Davis' equations which should be useful in computations of the collision efficiencies of uncharged ice crystals.