新型压电无阀微泵效率分析及试验研究

Efficiency Analysis and Experimental Study of a Piezoelectric Valveless Micropump with Novel Microchannel

提出了一种用于无阀压电微泵的新型效率模型,根据传统扩张/收缩管型结构设计出侧面带有环形面积新型锯齿型带锥度和无锥度两种微流道。用CFD软件对传统扩张/收缩型微流道及新型锯齿型微流道进行了三维流动模拟,绘制出几种微流道特性曲线,并用新型效率模型计算了三种微流道在两种限制条件(最大流量零压力头和最大压力头零流量)下的稳态效率,并进行了分析比较,结果表明由于结构改变,锯齿型微流道最大流量和压力损失实现了预期的变化,并且带锥度锯齿型微流道微泵稳态效率均大于标准扩张/收缩型微流道及无锥度锯齿型微流道微泵。最后制作出含有标准扩张/收缩及带锥度锯齿型微流道结构微泵,并对其进行试验,结果证明由于环形面积和锥度存在,带锥度锯齿形微流道微泵性能明显优于传统扩张/收缩型微泵。

The new efficiency model for the piezoelectric micropump has been presented, and two novel saw-tooth microchannel structure with adding vortex areas in profile （Saw-Tooth Microchannel and Saw-Tooth Microchannel with Taper） have been designed in virtue of the traditional diffuser/nozzle microchannel. Fluidic simulations of 3D have been performed to the traditional and novel saw-tooth microchannel with CFD（Gambit and Fluent） software under steady conditions. The characteristic curves of several microchannel have been drawn with mat-lab software, and the steady efficiency of the three microchannel under two limit conditions（the max flow rate at zero pressure head and the max pressure head at zero flow rate） have been calculated. The results showed that the pressure loss and flow rate confirm the expected changes because of the change of the structure, and the steady efficiency of the STT-microchannel is higher than that of other microchannel. Finally, the micropumps with STT-micro-channel and S-microchannel have been fabricated. Through experiment it proves that the performance of the micropump with STT-microchannel is excelled than the S-microchannel because of the presence of the voetex areas and the taper.