Abstract
This study proposes a new technique for controlling a liquid flow in a narrow gap. Two surface acoustic waves (SAWs) propagating in opposite directions on a gap wall are used for the flow control. The SAWs propagating on the wall leak into the liquid and induce a beat of the leakage waves. When the frequency difference between the SAWs is given, the beat propagates from the higher frequency side to the lower one, accompanying a liquid flow. This study shows that the velocity of the liquid flow is proportional to the frequency difference of the SAWs when the frequency difference is small, and also shows that the flow can be induced even in a gap having a height of 0.1mm.
