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Photomicrographic Investigation of Spontaneous Freezing Temperatures of Supercooled Water DropletsA photomicrographic technique for investigating eupercooled. water droplets has been devised and. used. to determine the spontaneous freezing temperatures of eupercooled. water droplets of the size ordinarily found. in the atmosphere. The freezing temperatures of 4527 droplets ranging from 8.75 to 1000 microns in diameter supported on a platinum surface and 571 droplets supported on copper were obtained. The average spontaneous freezing temperature decreased with decrease in the size of the droplets. The effect of size on the spontaneous freezing temperature was particularly marked below 60 microns. Frequency-distribution curves of the spontaneous freezing temperatures observed for droplets of a given size were obtained. Although no droplet froze at a temperature above 20 0 F, all droplets melted at 32 F. Results obtained with a copper support did not differ essentially from those obtained with a platinum surface.
Document ID
19810068862
Document Type
Other - NACA Technical Note
Authors
Dorsch, R. G. (National Advisory Committee for Aeronautics. Lewis Flight Propulsion Lab. Cleveland, OH, United States)
Hacker, P. T. (National Advisory Committee for Aeronautics. Lewis Flight Propulsion Lab. Cleveland, OH, United States)
Date Acquired
August 11, 2013
Publication Date
July 1, 1950
Subject Category
METEOROLOGY AND CLIMATOLOGY
Report/Patent Number
NACA-TN-2142
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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