Freezing Water with Sized AgI Particles. Part II: Theoretical Considerations.
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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VELOPED FOR THE HETEROGENEOUS NUCLEATION RATE OF SUPERCOOLED WATER DROPLETS BY THERMALLY GENERATED AgI particles. The rate equations are determined as a function of the AgI particle size, shape, and surface structure, critical embryo shape, temperature, and ice-AgI contact angle in water. The assumptions and approximations inherent in this treatment are evaluated. It was determined that the important assumption of an appreciable nucleation rate is inconsistent with the large uncertainty in the value of the contact angle. As a consequence, classical theory could account for the experimentally determined dependence of activity on the particles surface area. The appreciable nucleation rate also may not be used in Fletchers ice-filled pits site theory. It is shown how the statistical nature of the nucleation process provides a method by which classical and site theory may be differentiated. Author
- Atmospheric Physics
- Physical Chemistry