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Thomas E. Hoffer
and
Steven C. Mallen

Abstract

Measurements of evaporation rates suggest that when water droplets are exposed to certain contaminants, a monolayer can form which inhibits evaporation. Experimental droplet evaporation rates are compared to theoretical rates; for pure water the agreement is good, while for contaminated water a wide variance is noted.

Some of the implications of these experiments in relation to the dispersion of fogs are discussed.

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Thomas E. Hoffer
and
Steven C. Mallen

Abstract

A vertical wind tunnel which will support droplets in the size range of 50–200 μ is described. It consists of three sections, a diffuser, a profile forming section, and the observational section. The construction details of all three sections are provided with emphasis on velocity profile formation. Its materials are such that experiments requiring a clean atmosphere can be performed on droplets less than 200 μ in diameter.

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