Laboratory experiments on warm fog dissipation.
Marchetti, Michael Joseph
Taylor, Charles L.
Alberty, Ronnie L.
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Some of the more recent results of studies involving the use of hygroscopic materials and ionic surfactants as warm fog dispersants are covered in a brief survey of the literature. The fog chamber, equipment and experimental procedures used in this study are described in detail. Seeding agents utilized during these small-scale fog chamber experiments were limited to the use of hygroscopic materials, surfactants and ethyl alcohol. Results indicated that those hygroscopic agents tested, such as NaCl and glycerin, proved to be relatively effective warm fog dispersants compared to distilled water. The ionic and nonionic surfactants tested dissipated warm fog at approximately the same rate as distilled water and were considered ineffective. Ethyl alcohol appeared to initially increase the fog intensity, and thus, retard fog dissipation. Conductivity/Resistivity measurements and illustrations of the relative droplet sizes and shapes of the various agents used are also contained in this report. The effects on plants of four of the hygroscopic agents are also discussed and illustrated.
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