10302 高分子添加による管内抵抗減少流れの画像速度計測(OS8 流れの抵抗減少)

概要

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Experimental studies have been made on turbulent structures of water and drag-reducing turbulent flow in a straight pipe of rectangular cross-section (15mm×30mm). Velocity measurements were made using a Particle Image Velocimetry. An increase in the magnitude of the negative skewness in the streamwise velocity fluctuations is observed with polymer additives. The skewness profiles for the wall-normal velocity fluctuations have little differences between the water and polymer cases, while an increase in the flatness profiles in the wall-normal velocity fluctuations is observed with increasing polymer concentration. Maps of Galilean decomposed fluctuating vectors show footprints of the hairpin vortices which are larger in size for the polymer solution flow than those for the water flow.
社団法人日本機械学会の論文
2005-03-17