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Title
  • ja 平面網地の流体抵抗に関する基礎的研究
Alternative
  • Fundamental Studies of the Fluid Dynamical Resistance on the Plane Netting
  • ヘイメン アミジ ノ リュウタイ テイコウ ニ カンスル キソテキ ケンキュウ
Creator
Subject
  • NDC 660
Description
  • Other To determine the fluid dynamical coefficients for plane netting, the following studies werecarried out in the water circulating tank of Faculty of Fiseries, Kagoshima University and inthe towing tank of Faculty of Fisheries, Hokkaido University.As a rule coefficients for fluid dynamical resistance of netting depend on the projective areas,and therefore it becomes necessary to determine the experimental equations for the areastowards verious attack angles.In these studies, the minimum unit of the netting fabric is termed as a "Netting element". Atthe elementary fabric a horizontal cutting is made at the respective intermediate points of thefour knotted legs. The shape of a netting element is to be shown in the form "X".The netting used in these studies are "Weaver's knot netting" and the "twisted knotlessnetting" which are most familier in the Japanese fisheries.Basing on the two sets of tank-experiments made on the two kinds of the netting, thefollowing results were obtained :1) In the case of towing tank experiments the normal force coefficient and the tangentialforce coefficient are proved to be independent of the Reynolds number with in the range from 6×10^2 to 3×10^3; and in the case of the circulating tank experiments they are proved to be so withthe range from 8×10^2 to 3×10^3.2) The edge effect of the netting is not depending on mesh numbers when the value of2ij/(i+j) is larger than 6.0. In this case, "i" is the mesh numbers counted to the twinewisedirection and "j" is the counted to the normal direction, on the netting piece used. ･･･[the rest omitted]
Publisher 鹿児島大学
Date
    Created2016-10-31
Language
  • jpn
Resource Type departmental bulletin paper
Version Type VoR
Identifier URI http://hdl.handle.net/10232/13346
Journal
    • NCID AN00040498
    • ISSN 0453-087X
      • 鹿児島大学水産学部紀要=Memoirs of Faculty of Fisheries Kagoshima University
      • Volume Number35 Issue Number2 Page Start169 Page End253
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Oaidate 2023-07-18