Citation: WU Bi-Cheng, YAO Zhi-Yuan. Design and Experiment Study of Micro Droplet Generator Based on Ultrasonic Vibration[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(6): 931-935. doi: 10.11895/j.issn.0253-3820.170183 shu

Design and Experiment Study of Micro Droplet Generator Based on Ultrasonic Vibration

Nanjing University of Aeronautics & Astronautics, State Key Laboratory of Mechanical Structure Mechanics and Control, Nanjing 210016, China

Received Date: 23 March 2017
Revised Date: 24 April 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 51275229) and the National Major Equipment Development Foundation (No. 2012YQ100225).

A micro droplet generator based on V-shape linear ultrasonic motor was prepared to produce micro droplets with higher accuracy in the field of biochemistry. The device was composed of a micro droplet generator which was driven by the V-shaped linear ultrasonic motor, a three-dimensional displacement platform based on V-shaped linear ultrasonic motor, and a micro droplet separation unit based on the piezoelectric vibrator. The generating part consisted of an ultrasonic motor, a medical syringe, a silica flexible tube and a self-made micro nozzle based on glass. Utilizing the drive controller to drive the linear ultrasonic motor, the slipway pushes forward the syringe and the micro droplet was attached to the glass nozzle. The natural mode of the rod nozzle was excited by the piezoelectric vibrator. The attached droplet was separated from the tip of the nozzle after overcoming the viscous force. The separated droplet fell in a certain range. And the radius of the spherical droplet was calculated. In the experiment, distilled water was used as the initial liquid to investigate the characteristics of the micro droplets produced by the device. The experimental results showed that the droplet was attached to the tip of the micro nozzle which was formed by distilled water under the linear motor. By the vibration of the separation unit, the attached droplets formed the spherical droplets by overcoming the viscous forces in the tip of the nozzle. The radius of spherical droplets generated by this device was less than 40 μm by measuring the size.
- Ultrasonic motor,
- Piezoelectric vibrator,
- Micro nozzle,
- Micro droplet
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