Jpn. J. Appl. Phys. 47 (2008) pp. 4276-4281 |Previous Article| |Next Article| |Table of Contents|
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Air Flow in a Small Gap between a Bending Vibrator and a Reflector
Precision and Intelligence Laboratory, Tokyo Institute of Technology, R2-25, 4259 Nagatsutacho, Midori-ku, Yokohama 226-8503, Japan
(Received November 26, 2007; accepted January 30, 2008; published online May 23, 2008)
In this paper, we present numerical simulations and experiments of air flow induced in a gap between a piezoelectric bending vibrator and a reflector. Half of the simulation is based on the coupled analysis of piezoelectric elastic vibration and sound field using finite element method (FEM). The other half is the numerical fluid dynamics modeled using FEM where the driving forces are calculated on the basis of the acoustic streaming theory. One-directional streaming in the gap is predicted using the simulation and was successfully obtained in the experiments by introducing asymmetry both in the vibration distribution of the vibrator and the sound field. Air flow velocity of over 0.5 m/s was achieved using a vibrator of 30×20 mm2 with an electrical power consumption of 200 mW.
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