2024-10-13T21:09:43Z
https://ir.kagoshima-u.ac.jp/oai
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2024-07-30T01:16:46Z
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平面網地の流体抵抗に関する基礎的研究
Fundamental Studies of the Fluid Dynamical Resistance on the Plane Netting
1000020041709
今井, 健彦
IMAI, Takehiko
To determine the fluid dynamical coefficients for plane netting, the following studies were
carried out in the water circulating tank of Faculty of Fiseries, Kagoshima University and in
the 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 areas
towards verious attack angles.
In these studies, the minimum unit of the netting fabric is termed as a "Netting element". At
the elementary fabric a horizontal cutting is made at the respective intermediate points of the
four 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 knotless
netting" which are most familier in the Japanese fisheries.
Basing on the two sets of tank-experiments made on the two kinds of the netting, the
following results were obtained :
1) In the case of towing tank experiments the normal force coefficient and the tangential
force 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 with
the 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 of
2ij/(i+j) is larger than 6.0. In this case, "i" is the mesh numbers counted to the twinewise
direction and "j" is the counted to the normal direction, on the netting piece used. ･･･[the rest omitted]
鹿児島大学
Kagoshima University
1986-12-25
jpn
departmental bulletin paper
VoR
http://hdl.handle.net/10232/13346
https://ir.kagoshima-u.ac.jp/records/12783
0453087X
AN00040498
鹿児島大学水産学部紀要
Memoirs of Faculty of Fisheries Kagoshima University
35
2
169
253
https://ir.kagoshima-u.ac.jp/record/12783/files/AN00040498_v35-2_p169-253.pdf
application/pdf
7.4 MB
2016-10-31