剛球または水滴の水面への落下および水流により発生する音の研究 : 第2報,水流の場合

抄録

The aim of this paper is to report experimental results of sound generated by water flow such as in a waterbasin, curved tube or vertical tube. First, it is made clear that the main sound generated at the outlet of the washbasin provided with the vertical outflow pipe at the bottom is caused by an acoustically resonating cavity formed in the outflow pipe by surface tension and that the tisy sound in a bend tube connected with the outflow pipe of washbasin is caused when the bubble flow strikes the tube inside wall and results in sound generation. In case of the vertical elastic tube, sound is generated by the elastically bending motion of the tube caused by the unsteady change of the momentum of water film along the inside of the tube. Lastly, based on the results obtained above, a method to control sound generated in the vertical tube is proposed.