直接驱动型压电式喷头微滴产生过程数值模拟及试验研究

doi:10.3901/JME.2020.17.233

机械工程学报 ›› 2020, Vol. 56 ›› Issue (17): 233-239.doi: 10.3901/JME.2020.17.233

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直接驱动型压电式喷头微滴产生过程数值模拟及试验研究

肖渊^1,2, 张威¹, 王盼¹, 李红英¹

1. 西安工程大学机电工程学院西安 710048;
2. 西安市现代智能纺织装备重点实验室西安 710600

收稿日期:2019-12-04 修回日期:2020-03-11 出版日期:2020-09-05 发布日期:2020-10-19
作者简介:肖渊,男,1975年出生,博士,教授,硕士研究生导师。主要研究方向微滴喷射打印、智能纺织品。E-mail:xiaoyuanjidian@xpu.edu.cn
基金资助:
国家自然科学基金和西安市现代智能纺织装备重点实验室项目（2019220614SYS021CG043）资助项目（51475350）。

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

XIAO Yuan^1,2, ZHANG Wei¹, WANG Pan¹, LI Hongying¹

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

摘要/Abstract

摘要： 针对目前挤压管型压电式喷头结构复杂、组装工艺要求高及价格昂贵等问题，设计一种结构简化的环形压电陶瓷直接驱动喷射材料的微滴喷射装置。通过建立多物理场耦合压电式喷头微滴喷射两相流模型，研究驱动电压、流体黏度及表面张力等参数对微滴成形动力学行为的影响。在此基础上，利用构建的压电式喷头进行微滴喷射试验。结果表明：驱动电压幅值与产生微滴的速度及体积大小呈线性关系，喷射材料黏度增大产生的微滴喷射速度及体积减小，表面张力直接影响液滴形成过程的喷射材料液体丝带长度及断裂距离；采用喷嘴孔径为65 μm的喷头，在稳定喷射条件下，可按需产生直径约80 μm的均匀微滴，验证了设计的直接驱动式压电喷头按需产生均匀微滴的可行性。

关键词: 微滴喷射, 直接驱动, 压电式喷头, 多物理场, 数值模拟

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

中图分类号:

TS852

肖渊, 张威, 王盼, 李红英. 直接驱动型压电式喷头微滴产生过程数值模拟及试验研究[J]. 机械工程学报, 2020, 56(17): 233-239.

XIAO Yuan, ZHANG Wei, WANG Pan, LI Hongying. Numerical Simulation and Experimental Research of Micro-droplet Generation by Directly Actuated Piezoelectric Nozzle[J]. Journal of Mechanical Engineering, 2020, 56(17): 233-239.

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直接驱动型压电式喷头微滴产生过程数值模拟及试验研究

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

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