Development of Pump Using Ultrasonic Transducer and Opposing Surface (3rd Report)

-Observation of Gap-

Abstract

Currently, pumps are used in various fields to apply air and liquid. These pumps include sliding parts and there is a limit of life time due to friction and wear. To solve this problem, a number of pumps using ultrasonic vibration have been proposed. A common feature of ultrasonic pumps is having no sliding parts. Therefore, the life time of these pumps seems longer than that of the conventional pumps. In the previous study, we found an occurrence of pump effect when an opposing block faces ultrasonically vibrating surface with a small gap. The ultrasonic transducer has a hole to provide the path for fluid flow and the opposing surface was a tapered end of an aluminum cylinder. In this report we observed gap between two surfaces and verify relation ship among the gap, vibration amplitude of transducer and flow rate.