EXPERIMENTAL STUDIES OF SNOW ACCRETION ON POWER LINES

Experimental studies were carried out of the snow accretion on a power line using wind tunnel. Observations were made of the growth processes, especially their initial stage, together with measurements of wind speed around the snow accreted on the line. From the results obtained, the growth mechanism have been confirmed as follows: The coefficent of collisions of snow particles against the trajectory of the line was nearly 100%, but the snow particles which collided against the line, rebounded from it, reducing the coefficient of collection to less than 10%. Snow particles which stayed at around the stagnant point of the front, formed an equilibrium triangular prism wherein the prism was defined by the repose angle of snow particles, which is the function of the adhesive force and the shear stress of a wind, as well as the trajectory of the accretion. When the mass of the prism exceeded a critical weight, which was defined by the adhesive force, the prism began to rotate around the line by its own weight. Then, the distribution of wind speed around the accretion changed as a result of the drag effect of the rotating prism. This change of the wind suggests that the shear stress of the wind around the upper side of the prism decreased; then the snow particles could deposit more easily on this effective stagnant region. By this continuous deposition on the upper side of the prism, the whole snow accretion rotated. Finally, the snow accretion grew to a cylindrical snow mass which had a spiral face of growth. /Authors/

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    • This paper appeared in TRB Special Report 185, Snow Removal and Ice Control Research. 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
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    Transportation Research Board

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  • Authors:
    • Fujino, Kazuo
    • Kobayashi, Shun'ich
    • Wakahama, Gorow
  • Conference:
  • Publication Date: 1979

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  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 95-100
  • Monograph Title: SNOW REMOVAL AND ICE CONTROL RESEARCH
  • Serial:

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  • Accession Number: 00193864
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI, STATEDOT
  • Created Date: Jun 13 1979 12:00AM