Influence of Electrostatic Forces on Riming by Thin Ice Plates

[摘要] Numerical investigations of riming by thin ice plates were conductde, includnig the effects of coulombic forces on collision efficiency. A superposition method was used to determine the trajectories of the ice crystal and aerosol particle. The results indicate that electrostatic forces may be important in the evolution of cloud microstructure because they reduce the critical size to which an ice crystal must grow before it can begin to rime.In an environment of -10°C, 700mb, the smallest uncharged ice plate capable of riming lies between 147 and 160μm half-width. At -18°C, 400mb, the critical size of the ice plate is reduced to between 103 and 133μm for the uncharged case, and to less than 103μ when moderate attractive electric charges are present on the ice plate and water droplet.

[学科分类] 大气科学