水-微細固体粒子懸濁液の抵抗減少効果

概要

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Drag reduction on the pressure loss of a circular pipe and the drag of a free-falling sphere in water/fine solid particle suspensions has been shown experimentally. The tested suspensions were carbon black, kaolin and SiO_2 suspensions. The pressure loss data of the pipe flows in the laminar and turbulent flow ranges were obtained, and the rheological equation of these suspensions was decided by the flow curve. The experiment for the drag of a sphere was performed on the free-falling sphere in the suspensions. Twenty spheres between 6.35mm and 14.96mm in diameter were tested. Four ultrasonic transducers, which were set facing and in contact with the side wall of the vessel filled with the test suspensions in pairs of ultrasonic transmitter and ultrasonic receiver, were used for the falling velocity measurement. It has been shown from this study that the drag reduction of a sphere occurs in carbon black suspensions, and the range of Reynolds numbers obtained for the reduction is Re≧8×10^3.
一般社団法人日本機械学会の論文
1992-04-25