A preliminary theoretical analysis of a modified membrane filter technique to detect ice-forming nuclei in a thermal diffusion chamber
Tóm tắt
A preliminary mathematical analysis of a membrane filter technique for estimating the population of Å-sized ice-forming nuclei is presented. The technique consists of drawing an aerosol sample through a membrane filter and then exposing the surface of the filter to controlled conditions of temperature and water vapor supersaturation in a dynamic chamber. The number of ice crystals which form on the filter is related in sometimes subtle ways to the concentration of ice forming nuclei in the aerosol sample. In order to enhance experimental control of supersaturation during filter development, condensation nuclei are also deposited on the filter. Mathematical models are constructed for the deposition of aerosol particles on membrane filters, evolution of the water vapor field in the dynamic chamber, growth of solitary ice crystals on membrane filters, and the competition in populations of ice crystals for water vapor. Special emphasis is placed on the role of static electricity in the deposition of aerosol particles, and the role of condensation nuclei on the production of ice crystals.
Tài liệu tham khảo
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