10305 フレキシブルチューブの乱流摩擦抵抗低減に関する実験的研究(OS8 流れの抵抗減少)

概要

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In this research, the pressure loss and the flow rate for three kinds of flexible tubes, whose thicknesses are 2, 3 and 4mm, were measured. The friction factors of flexible tubes were compared with that of the rigid tube, and the drag reductions for the present tubes were estimated. The external pressure was controlled using the concentric pipe, so as to be balanced with the internal pressure. Therefore the influence of the variation in the inside diameter on the friction factor is negligible. Friction factors of present flexible tubes were smaller than that of the rigid tube. With decreasing the thickness of flexible tube, the drag reduction ratio became larger. The maximum drag reduction ratio of about 12% was obtained for the flexible tube of 2mm thickness.
一般社団法人日本機械学会の論文
2005-03-17