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Title: A STUDY OF DEW AND FROST FORMATION ON RETRO-REFLECTORS
Accession Number: 00219549
Record Type: Component
Abstract: THE FORMATION OF DEW AND, AT SUBFREEZING TEMPERATURES, FROST, ON RETRO-REFLECTIVE MATERIALS, WHICH DEPEND ON COLLIMATED INCIDENT LIGHT FOR EFFICIENT REFLECTION, REFRACTS AND SCATTERS THE LIGHT BEAM, RENDERING THEM LESS BRIGHT, MEANS OF RELIEF WERE STUDIED. YEARLY INCIDENCE OF DEW AND FROST WAS DESIRED TOGETHER WITH HOURLY PROGRESS, UNDER CIRCUMSTANCES THAT WOULD PERMIT SIMULTANEOUS DIRECT COMPARISON OF ALL MATERIALS WHENEVER DEW OCCURRED. THE TEST SITE IS LOCATED IN WASHINGTON COUNTY MINNESOTA. THE FINDING AT THIS SITE CAN LIKELY BE COMPARED ONLY TO LOCALITIES HAVING SIMILAR AVERAGE CLIMATOLOGICAL DATA, RELATIVE ELEVATION AND EXPOSURE. TWO GENERAL APPROACHES OF INHIBITING DEW FORMATION ARE /1/ TO CHANGE THE DEW PARTICLE FROM A SPHERICAL DROPLET TO A FILM, AND /2/ REPLACEMENT OF HEAT LOST BY RADIATION. A CHEMICAL SURFACTANT WAS EXPERIMENTALLY. MASSIVE HEAT CONDUCTIVE BACKINGS ILLUSTRATE THAT INTERNAL HEAT STORAGE IS POSSIBLE.
Supplemental Notes: Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
Monograph Title: Monograph Accession #: 01055083
Authors: WOLTMAN, H LPagination: pp 63-66
Publication Date: 1965
Serial: Media Type: Print
Features: Figures
(3)
; Tables
(2)
TRT Terms: Uncontrolled Terms: Geographic Terms: Old TRIS Terms: Subject Areas: Highways; Materials; Safety and Human Factors
Files: TRIS, TRB
Created Date: Dec 12 1994 12:00AM
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