内置混合器式无阀压电泵性能

Performance of valveless piezoelectric pump with built-in mixer

为了在输送流体过程中实现不同流体的充分混合,设计挡板式内置混合器、阻流体式内置混合器及绕流体式内置混合器等3种内置混合器式压电泵.采用有限元分析软件COMSOL Multiphysics对压电泵流场混合效果进行数值模拟,提取流场典型切面混合浓度,并通过混合试验验证混合度数值模拟的可靠性,同时研究了内置混合器对压电泵泵送能力的影响.研究结果表明:内置混合器可显著提高压电泵的混合能力;内置混合器的结构与参数不同时对混合度有较大影响,在驱动频率为727 Hz,驱动电压为150 V时,具有6个混合单元的绕流体式内置混合器压电泵的混合度可达99.35%;无内置混合器式压电泵的泵送流量为457.3 mL/min,安装内置混合器的压电泵均有不同程度的流量损失.试验结果进一步验证了仿真分析的正确性,为研究压电泵混合和泵送综合性能提供了一定的参考.

In order to achieve the sufficient mixing of different fluids in the process of conveying fluids,three built-in mixer types piezoelectric pumps were designed,including baffle built-in mixer,resistive fluid built-in mixer and winding fluid built-in mixer.The finite element analysis software COMSOL multiphysics was used to numerically simulate the mixing effect of the flow field of piezoelectric pumps,the mixing concentration of a typical cut of the flow was extracted and calculated,and the reliability of the numerical simulation of the mixing degree was verified by the experiment.At the same time,the effect of the built-in mixer on the pumping capacity of the piezoelectric pump was also stu-died.The results show that the built-in mixer has a significant effect on the mixing ability of the piezoelectric pump.The different structures and parameters of the built-in mixer have a large impact on the mixing degree.The mixing degree of the fluid-wound built-in mixer piezoelectric pump with six mixing units can reach 99.35%when the driving frequency is 727 Hz and the driving voltage is 150 V.Meanwhile,the pumping flow rate of the piezoelectric pump without built-in mixer is 457.3 mL/min,and the piezoelectric pumps with built-in mixer has different degrees of flow loss.The experimental results further verify the correctness of the simulation analysis,and it provides a reference for the study of the hybrid and pumping performance of piezoelectric pump.