HAIL SUPPRESSION BY APPLICATION OF EXTERNAL ELECTRIC FIELD
Journal Title: International Journal of Scientific Research and Reviews - Year 2013, Vol 2, Issue 1
Abstract
The lightning is often followed in the cloud by a rapidly increasing intensifying echo and then by a gush of rain or hail at the ground. The increase in radar reflectivity in small volumes of the cloud following lightning suggested that the electric discharge is influencing the size of particles in the cloud. The analysis indicated that within 30 seconds after a lightning discharge, the mass of some droplets increased as much as 100-fold as the result of an electrostatic precipitation effect. Later observations disclosed that the rain gush phenomenon can also occur in regions of the cloud that are colder than 00C and that here gush can be of hail or rain. During a lightning discharge maximum electric field (~10 e.s.u.) is produced near the channel. It has been shown that action of a constant and uniform electric field accelerated the condensation of water vapor by a factor depending upon the intensity 0f electric field. It was shown that a droplet acquires a particular size under very low supersaturation under an electric field, which would otherwise, require very high supersaturation. We have shown that in the resultant effect on a droplet due to an external electric field and the field induced due to the central dipole, the rate of nucleation in water vapor condensation and ice glaciations is about 100 times more near break-down for dry air, as compared to that in absence of electric field. The calculations show that at a given relaxation time and temperature, the equivalent supersaturation decreases with increase in electric field. Effective role of external electric field in nucleation has been applied to explore the hail suppression phenomenon. It has been found that an application of a small external electric field is equivalent to a large supersaturation ratio. Large size ice crystals (hails) are split into smaller particles, so that damage caused by hails is reduced. At the same time, this happens at an early stage.
Authors and Affiliations
Singh N
Keywords
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