Abstract
In this paper, a new mixing method for micro-liquid is proposed. It is well known that the free surface of a liquid is agitated when ultrasound propagating in the liquid reaches that surface. This is due to the radiation pressure of ultrasound. By using this pressure, liquid in a vessel can be mixed without direct contact with the liquid. The mixing system consists of a vessel (3.8×5.6×20mm) that contains the liquid to be mixed and ultrasound sources (1.6MHz, 20Hz On-OFF modulation) that are arranged outside the vessel. The mixing flow was measured by using the Schlieren visualization method. Our results demonstrated that 250μL liquid can be mixed within 1.8 sec when our mixing system is used.
