Accession Number : AD0727183

Title :   The Effect of Liquid Water Content on Nucleation Efficiency in a Cold Chamber.

Descriptive Note : Master's thesis,

Corporate Author : SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY RAPID CITY INST OF ATMOSPHERIC SCIENCES

Personal Author(s) : Dorland,Dianne

Report Date : 1970

Pagination or Media Count : 83

Abstract : Detailed studies have been carried out concerning the importance of liquid water content on nucleation efficiencies of a wide variety of cloud seeding generators at temperatures between -5C to -20C. Earlier work by Steele and Davis has indicated that increases in efficiencies of three orders of magnitude can be realized with increased liquid water content at temperatures around -12C, while little effect was apparent at -20C. The importance of contact nucleation at the warmer temperature regions was also studied to determine if this process could theoretically cause increased efficiencies with increases in liquid water. Evaluation of experimental data, herein described, show no significant increase in efficiencies as the liquid water content varies from 1.0 gm/cubic meter to 8.0 gm/cubic meter. Both the theoretical and experimental data appear to support the premise contact nucleation is less important than sublimation and condensation when the initial nuclei concentration is 100,000 particles/cc or less. (Author)

Descriptors :   (*ARTIFICIAL PRECIPITATION, ICE FOG), SILVER COMPOUNDS, IODIDES, NUCLEATION, DEW POINT, WIND TUNNELS, EXPERIMENTAL DESIGN, THESES

Subject Categories : Meteorology
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE