摘要
介绍了一种基于压电驱动的数字化微喷射技术。利用逆压电效应,对压电驱动器施加周期性电场,使与之固连的微管道固壁产生周期性运动,固壁边界层内的流体随管壁一起运动,并通过粘性力将运动传递,带动微管内部流体一起运动,实现了微流体的驱动。以粘性不可压缩流体运动的纳维-斯托克斯方程为基础,得到了压电驱动微管道内流体的运动控制方程及其解;在此基础上分析了形成微喷射的原理。对微喷射进行了实验研究,喷出的液体量微小、可控,且适用不同流体的喷射。
A novel microinjection technique driven by piezoelectric actuator was presented. The actuator connected to the solid wall of the microchannel exerts a periodicity disturbing on the solid wall and the boundary flow obtains a movement along the solid wall. The viscous force within the liquid transfers the movement, in consequence; the microfluidic body obtains a movement. The radial distribution of the axial velocity and the cross sectional mean velocity were derived analytically based on Navier-Stokes equation for incompressible viscous fluid. The principle of microinjection was analyzed. The validity of the presented principle was verified by experiments. The volumes of each injection droplet are controllable and uniform, the system can work normally over a rather wide kind of the fluid materials.
出处
《机床与液压》
北大核心
2008年第8期17-20,共4页
Machine Tool & Hydraulics
基金
博士学科点专项科研基金项目(20060288005)
江苏省自然科学基金项目(BK2007209)
关键词
数字化微喷射
压电驱动器
微流体
边界层
Digital microinjection
Piezoelectric actuator
Microfluidic systems
Boundary layer
