压电无阀微混合器的数值模拟  

Numerical simulation for piezoelectric valve-less micro-mixer

作　　者：何秀华[1] 邓许连[1] 毕雨时[1] 王健[1] 禚洪彩[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《排灌机械工程学报》2011年第4期292-296,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏省自然科学基金资助项目(BK2007095)

摘　　要：设计了一种压电无阀微混合器,对微混合器的结构和工作原理进行了说明和分析,并对其进行了数值模拟.利用ANSYS软件对微混合器的驱动部件圆形复合压电振子进行了瞬态动力学分析,研究了压电振子中心平面上各点在正弦交变电压驱动下的振动位移随各点半径、驱动电压的变化规律,发现各点位移呈正弦变化规律,各点振幅随半径的增大而减小,随驱动电压的增大而增大.根据压电振子各点位移变化规律拟合得到了压电振子运动位移方程,并根据位移方程编写了UDF程序,经编译后将UDF程序调入到Fluent软件中,以此作为设定压电振子的运动边界条件,采用动网格模型对微混合器进行了动态数值模拟,得到了压电无阀微混合器的流量及微混合器不同时刻的微混合器腔内的混合情况.结果表明:设计的压电无阀微混合器不仅能实现流体泵送,也可以在较短的时间内实现流体间的均匀混合.A piezoelectric valve-less micro-mixer was designed.Structure and working principle of the micro-mixer were illustrated and analyzed.Transient dynamic analysis was done on the round composite piezoelectric vibrator using ANSYS software.Displacement changing laws of the points on the center plane of the vibrator with radius and driving voltage under condition of the piezoelectric vibrator driven by sinusoidal alternating voltage were studied.It is found that displacements of the points behave sinusoidal changing laws.Amplitudes of the points decrease with radius but increase with driving voltage.Motion displacement equation of the piezoelectric vibrator was fitted according to displacement of each point on piezoelectric vibrator.A UDF program was edited and complied according to the motion displacement equation,and then the program was transferred to the Fluent software used as the moving boundary of the piezoelectric vibrator.Dynamic numerical simulation was carried out on the piezoelectric valve-less micro-mixer,as well as the flowrate of the micro-mixer and mixing conditions in the micro-mixer at different time were obtained.The results show that the piezoelectric valve-less micro-mixer designed is not only able to pump fluids but also to get fluids mixed well in a short time.

关 键 词：压电无阀微混合器 数值模拟 压电振子 运动边界 动网格 

分 类 号：S277.9[农业科学—农业水土工程] TH38[农业科学—农业工程]