生物が付着したホタテ養殖用浮子およびロ-プの流水抵抗について

概要

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A study was conducted to determine the drag coefficients of float and rope presently used in scallop culture facilities. The drag forces of a polyethylene spherical float (30cm in diameter) and a polypropylene three-strand laid rope (24mm in diameter), with different encrusted conditions of marine organisms, were measured in an experimental flow tank.The experimental results were drawn in CD-Re diagrams (CD: drag-coefficient, Re: Reynolds number). The average value of CD was 0.75 for the floats encrusted with barnacles, blue mussels and plumed worms in 3.5×104<Re<105, and CD was 0.52 for the float scraped off marine organisms from the surface in 3.5×104<Re<8×104. For the rope when set normal to the flow, CD was 1.4 for the rope with amphipods and skeleton shrimps, and CD was 1.8 for the new rope without organisms in 2×103<Re<104.
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