203 入口オリフィス管の振動による渦輪の観察

抄録

When an orifice tube oscillates vertically in water, vortex rings develop through expulsion of water from the orifice both above and below the orifice plate. If the input condition to vibrate the orifice tube is specified, the time-mean flow going away from the orifice plate in one direction is induced during one period because the quantity of the water, which is entrained into the vortex ring from the surface of the orifice plate and the surroundings and is transported with it, is different between above and below side of the plate. This paper describes the behavior of the vortex rings visualized with the tracer method and also gives a brief summary of the experimental study to apply the above mentioned phenomena of the vortex ring to a vibration pump.