滑管内静水中における砂れきの沈降, 転動および滑動

概要

論文の詳細を見る
Falling, rolling or sliding motion and the descending velocity of a grain of gravel in rest water in a vertical or inclined smooth pipe were investigated. The diameter of the grain was about 1～5 mm, and the pipe was of a transparent hard vinyl, 38.5 mm in inner diameter. The formula which expressed the descending velocity considering the shape of the grain was theoretically established. From this formula and the experimental results, the kinetic coefficient of friction between the pipe wall and grain in the case of rolling or sliding was calculated. The static coefficient of friction was also measured and compared with the kinetic one. As a result, it was found that the frictional character of the pipe wall was similar to that of brass, and the sliding or rolling coefficient of friction showed respectively about one half or one third of the static coefficient
一般社団法人日本機械学会の論文
1964-05-25