A Novel Pumping Mechanism of Using Ultrasound Induced Pressure and Cavitations for Micro-Pump Development

我们开发了一种新的泵送方法，利用超声诱导的压力差和空化。在水箱底部制作超声波振动面。在振动面和水面之间形成半波长的驻波。将一根内径为0.37mm的小垂直上升管插入水中1/4波长的深度。在上升管进口周围形成微气泡云，抑制了振动周期中的负压，从而实现了连续抽水。通过实验研究探讨了其机理和基本特征。泵压超过23 kPa，最大流量10 ml/min。研制了微型泵样机。

We have developed a new pumping method of using ultrasound induced pressure differences and cavitations. An ultrasonic vibrating surface is fabricated at the bottom of a water tank. Standing waves of half wavelength are formed between the vibrating surface and the water surface. A vertical rising pipe of small inner diameter of 0.37mm is inserted in the water in a depth of 1/4 wavelength. Micro-bubble cloud is formed around the rising pipe inlet, which suppresses the negative pressure in the vibrating cycle and results in continuous pumping of water. The mechanisms and fundamental characteristics have been explored by experimental investigations. A pumping pressure of over 23kPa and a maximum flow rate of 10 ml/min were achieved. A prototype of micro-pump has been developed.