• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2020, Vol. 56 ›› Issue (17): 233-239.doi: 10.3901/JME.2020.17.233

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Numerical Simulation and Experimental Research of Micro-droplet Generation by Directly Actuated Piezoelectric Nozzle

XIAO Yuan1,2, ZHANG Wei1, WANG Pan1, LI Hongying1   

  1. 1. College of Mechanical and Electrical Engineering, Xi'an Polytechnic University, Xi'an 710048;
    2. Xi'an Key Laboratory of Modern Intelligent Textile Equipment, Xi'an 710600
  • Received:2019-12-04 Revised:2020-03-11 Online:2020-09-05 Published:2020-10-19

Abstract: A micro-droplet generator with simplified structure by ring piezoelectric ceramic directly driving the ejection material is constructed to solve the problem of the complicated structure, high assembly process requirements and high price caused by squeezed piezo-type nozzle. The effects of driving voltage, fluid viscosity, surface tension and other parameters on the dynamic behavior of micro-droplet forming is studied by establishing a two-phase flow model of piezoelectric nozzle micro-droplet ejection by multi-physics coupling. Based on this, the droplet ejection test has performed using the constructed piezoelectric nozzle. The results show that driving voltage amplitude has a linear relationship with the velocity and volume of droplet production. The ejection velocity and volume of droplet produced decrease with the increase of ejection material viscosity, and the surface tension directly affects the length of the liquid ribbon of the jetting material during the droplet formation and fracture distance. Under the stable ejection conditions, a nozzle with a diameter of 65 μm can produce uniform droplets of about 80 μm in diameter as required, which verifies the feasibility of the designed directly driven piezoelectric nozzle to generate uniform micro-droplets on demand.

Key words: micro-droplet ejection, directly driving, piezoelectric nozzle, multi-physics, numerical simulation

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