Ice particle generation during evaporation


Dong Y., Oraltay R. G. , Hallett J.

ATMOSPHERIC RESEARCH, vol.32, pp.45-53, 1994 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 32
  • Publication Date: 1994
  • Doi Number: 10.1016/0169-8095(94)90050-7
  • Title of Journal : ATMOSPHERIC RESEARCH
  • Page Numbers: pp.45-53

Abstract

Simulated soft hail (graupel) particles are grown in a laboratory chamber and evaporated under controlled conditions of wind speed, temperature and undersaturation. Particle breakup is observed directly and recorded by video, and also inferred from abrupt changes of charge. A particle with a diameter of a few mm may give rise to several hundred particles under some conditions. Breakup occurs by irregular evaporation of the rime branches, which thin to less than 10 mu m prior to fracture. Break up is also observed during evaporation of individual faceted vapor grown crystals. All ice particles are strong; the fracture strength is estimated to be at least ten times the bulk fracture strength of ice.