IMPROVING VISIBILITY DURING PERIODS OF SUPERCOOLED FOG.

Six tests of dispersal systems using propane were conducted in Hanover, New Hampshire during winter 1964-65 and a like number in Greenland during summer 1965 mainly on supercooled fogs and in a few instances when air temperatures were within the lower 2 meters at or slightly above freezing. Propane...

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Bibliographic Details
Main Author: Hicks,J. R.
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
Format: Text
Language:English
Published: 1966
Subjects:
Terminal Flight Facilities
Meteorology
(*FOG
COUNTERMEASURES)
(*VISIBILITY
FOG)
(*ARTIFICIAL PRECIPITATION
PROPANE
AEROSOLS
NUCLEATION
INSTRUMENTATION
FLAMMABILITY
CRYSTALS
THERMAL PROPERTIES
CLATHRATE COMPOUNDS
AIRPORTS
Greenland
Online Access:http://www.dtic.mil/docs/citations/AD0648484
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0648484
Description
Summary:Six tests of dispersal systems using propane were conducted in Hanover, New Hampshire during winter 1964-65 and a like number in Greenland during summer 1965 mainly on supercooled fogs and in a few instances when air temperatures were within the lower 2 meters at or slightly above freezing. Propane was introduced into the fog as a liquid aerosol to induce spontaneous nucleation either by cooling or by clathrate reaction which may be important in fog modification. The tests show that liquid propane will improve visibility in fogs, is safe to use, and no standby time is needed. The system may be permanently installed with either radio or manually controlled valve units, and is inexpensive, a cost of $20/hr estimated to keep an airport approach zone clear of fog. Details of the individual tests conducted are given. The dispensing apparatus, propane flammability tests, and the theory of formation, growth, and precipitation of ice crystals, thermal reaction, and the clathrate concept are discussed. (Author)

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