110 疎水性を有する壁面微細構造が抵抗減少効果に与える影響(2)(OS1-3 流れの抵抗低減,OS1 流れの抵抗抵減,オーガナイズドセッション)

概要

論文の詳細を見る
We study the effect of hydrophobic surfaces on drag reduction in Newtonian laminar flow through a rectangular channel. Fine fabrication is given to the test wall surfaces so that the groove pattern and the groove area ratio may be changed methodically, and their surfaces are coated with PTFE. Hereby the surface shows the high contact angle as 135°. Drag reduction is estimated by pressure loss measurement in a 12 x 12 mm channel. A series of experiments shows that the drag reduction increases with increase of the area ratio of the groove when the aspect ratio is large enough. The drag reduction ratio is obtained to 5%. Furthermore it is indicated that the difference in the groove patterns gives the difference to the drag reduction. Air-liquid interface is visualized in relation to the drag reduction, and the interface shape is observed.
一般社団法人日本機械学会の論文
2007-11-17