フィッシュポンプ利用に関する研究-IV : サイフオンによる水流分布について
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概要
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In fishing operation using a pump, it is important to know stream patterns around the suction nozzle, as they possibly indicate an effective range of the suction power which may or may not vary depending on such conditions as pertinent to the position of the nozzle and the suction head. Therefore, preliminary experiments were carried out in a glass aquarium (75×40 ×48cm) in which a vinyle hose (5mm in inner diameter) was arranged as a siphon; the suction nozzle was held either upward, downward, or on a level, with the suction head kept at 50cm or 100cm. Under these conditions the stream patterns were photographically observed by dropping a rhodamin solution into the water (Plates I-III). On the basis of the photographic observation, cross sectional views of the stream patterns were schematically drawn for the various siphoning conditions. In the diagrams, the stream line is the of force, and the equipotential surfaces which each cross at right angles with the line of the force are drawn by taking the inner diameter of the siphon hose as unit (Figs. 1-4). Ratios of the equipotential surface are compared among the various siphoning conditions (Table 1). The results revealed that no remarkable changes took place in the stream patterns around the suction nozzle regardless of the position of the suction nozzle or change of the suction head. Since the velocity of the stream abruptly decreases with the increase of the distance from the suction nozzle, it should be suggested that fisn have, to be concentrated around the suction nozzle as much as possible in order to efficiently pump them up.
- 公益社団法人 日本水産学会の論文
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