无阀微泵非稳态特性及整流效率仿真  

Simulation of unsteady characteristics and rectification efficiency of valveless micropump

作　　者：曹超[1] 应济[1] 焦致凯[1] 

机构地区：[1]浙江大学机械工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2013年第6期1036-1042,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50475104);浙江省自然科学基金重点资助项目(Z106519)

摘　　要：根据能量耗散和压强降低原理,分别研究了扩张/收缩管无阀微泵所处非稳态情况下流量变化与总压损失和压强损失之间的关系.为获得扩张/收缩管组件内流体流动在谐波压强下的非稳态响应特性,利用有限元软件在不同Womersley数以及压强幅值分别为10、30、50kPa条件下对扩张角为7.0°、9.8°、13.0°的扩张/收缩管组件进行数值模拟.仿真结果显示,Womersley数越大,流量变化相对于压强的滞后越大,压强幅值越大,流量变化相对于压强的滞后越小.当压强幅值为30、50kPa,Womersley数相对较小时,在扩张管组件内会有流量峰值随Womersley数的增加而递增的现象出现.随着驱动频率的变化,整流效率存在一峰值,且压强幅值越大整流效率的峰值以及峰值处对应的Womersley数也越大.According to the principle of energy dissipation and pressure loss, this work studied the relationships between the change of flow with total pressure loss and pressure loss of diffuser/nozzle valveless micropump in the case of unsteady condition. In order to obtain the unsteady response characteristics of fluid flow that in diffuser/nozzle component which its divergence angle was 7.0°, 9.8°, 13.0° under different Womersley number and harmonic pressures which its amplitude was 10,30 and 50 kPa, analysis was performed by the finite element software. Simulation results shows that. greater the Womersley number, the change of the flow which relate to the lag of the pressure will greater;greater the pressure amplitude, the change of the flow which relate to the lag of the pressure will decrease. When the pressure amplitude is 30,50 kPa, the phenomenon that the peak of flow increases with the increase of Womersley number will occur in the diffuser component when Womersley number is relatively small. With the change of driving frequency, the rectification efficiency exists an optimal value. The peak of rectification efficiency and Womersley number in this peak place will rise with the increase of pressure amplitude.

关 键 词：无阀微泵 总压损失 压强损失 

分 类 号：TH38[机械工程—机械制造及自动化]