Abstract
This paper proposes a novel pumping method using ultrasound induced pressure differences and cavitations. An ultrasonic vibrating surface is fabricated at the bottom of a water tank. Standing waves are formed between the vibrating surface and the water surface. A vertical rising pipe of a small inner diameter of typically 0.3mm is inserted in the water in a typical depth of 1/4 to 1/2 wavelengths. Increasing the power of the ultrasound, steady cavitation clouds start forming around the pipe inlet, which suppresses the negative pressure in the vibrating cycle and results in continuous pumping of water. The pumping mechanisms are revealed and the pumping capability as well as characteristics is clarified. A pumping pressure of over 20kPa can easily be achieved by the proposed pumping method.
