硝子玉浮子の流水抵抗について-II

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タイトル別名
  • Hydrodynamic Studies on the Resistance of Spherical Glass Floats for Fishing Net-II
  • ガラスギョク ウキ ノ リュウスイ テイコウ ニ ツイテ 2
  • Resistance variation of the floats covered with various shelter-nets
  • 保護網の各種要因変化による浮子の抵抗変化

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抄録

In order to make clear how the resistance of glass floats covered with shelter-nets made of the two-hold twines varies with the difference of the net (e. i. materials, diameters of netting cord, size of mesh, and direction of the float), a series of measurements was pursued. The results obtained are summerized as follows:<br> 1) The rate of increase of resistance due to the sheltering with net is proportional to the diameter of the netting cord. (Fig. 1)<br> 2) The drag coefficient varies considerably, within the range of small meshes, with the difference of meshes. But it is practically constant when the size of mesh exceeds 7.5cm. (Fig. 2)<br> 3) The difference of drag coefficient by kinds of materials of the shelter-net is insignificant practically. Namely, the drag coefficient of the floats covered with textiles having fluffy or rough surface, such as CREMONA and MANILA twines, is measured only 10% larger than that of SARAN and COTTON twines having smooth surface.<br> 4) The drag coefficient of floats may be increased proportionally with angle which the direction of current makes with the axes passed through the two selvage-ends of the covering net. But the difference is about 10% at maximum, which is insignifficant practically.

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