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Title: An investigation of specialized whiteout seeding procedures
Authors: Cornell Aeronautical Laboratory.
Mee, Thomas R.
Eadie, W. J.
Keywords: Ice
Ice fog
Dry ice
Seeding machine
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Research report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 124.
Description: Research Report
Summary: Investigations were carried out to develop field techniques and equipment that could be used by U. S. Army personnel to dissipate whiteouts. Several types of seeding vehicles were examined, including drone aircraft, mortar shells, rockets and regular aircraft. With the objective of improving efficiency of the dry-ice seeding process, an investigation was conducted to delineate the various physical processes that occur during seeding. Measurements were made of the distance a dry-ice pellet falls before subliming completely, and the number of ice crystals produced by a dry-ice pellet was determined, both as a function of pellet size and ambient temperature. It was discovered that the ice-crystal productivity of dry-ice pellets falling at their terminal velocities decreases sharply at temperatures warmer than about -5°C, whereas the ice-crystal productivity of slowly moving pellets is not greatly affected. A device for converting liquid CO2 into dry-ice pellets was conceived, and the concept was employed in the development of an emergency-seeding device for use in aircraft. The device would be particularly valuable during unexpected encounters with whiteouts in remote regions.
Appears in Collections:CRREL Research Report

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