Non-contact transport system for a liquid using ultrasonic radiation force

为了在制药和高质量化工领域的应用，对液滴的全非接触输送提出了很高的要求。非接触式混合和分配技术也是必需的。我们成功地利用半圆柱形声导实现了直径1.5 mm的乙醇液滴的非接触式线性传输。该波导由一个弯曲振动板和一个半圆柱反射器组成，在波导中激励一个行波声场。由于声场的辐射力，液滴被悬浮，然后由于声流的作用，液滴被水平方向推动。传输距离为65 mm，末端速度大于2m/s，成功地实现了两个液滴的非接触混合，并通过安装在反射板上的小孔投射出一个液滴。

For the application in pharmaceutical and high-quality chemical industries, totally non-contact transport of droplet is highly demanded. Techniques for non-contact mixing and dispensing are also required. We have succeeded in the noncontact linear transport of ethanol droplets of 1.5 mm in diameter using a semi cylindrical acoustic waveguide. The waveguide was composed of a bending vibration plate and a semi cylindrical reflector, and a traveling wave acoustic field was excited in the waveguide. The droplet was levitated due to the radiation force of the acoustic field, and then, pushed in horizontal direction because of acoustic streaming. The transportation distance was 65mm and the terminal velocity was over 2 m/s.We also succeed in noncontact mixing of two droplets, and dispensing a droplet through a hole installed in the reflector plate.