表面に細溝を有する回転円板の抵抗減少効果(OS.12 機能性マイクロデバイスの創製・評価)

概要

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The purpose of this study is to obtain the new type of the drag reduction for the frictional moment of an enclosed rotating disk by using the fine spiral grooves on the disk surface. The experiments were carried out the measurement for the frictional moment of an enclosed rotating disk with fine spiral grooves, of which were 120〜160 and 0.1-0.2 mm in the number and the depth, respectively. The Reynolds number range is 10^5〜6×10^5. Test fluids are tap water and aqueous solutions of glycerin. It was seen that the drag reduction occurred in the turbulent flow range at the non-dimensional axial clearance (s/a)=0.22 and 0.33, the maximum drag reduction patio was about 11%. The drag reduction depends on the number, the angle and the depth of the grooves.
一般社団法人日本機械学会の論文
2004-03-03