非对称电极交流电热泵的流体输运及混合

Mircrofluidic transport and mixing by AC electrothermal with asymmetric electrodes

摘要:

为满足微流控芯片在化学分析、细胞培养、药物测试等领域中流体驱动与混合的需要,对传统经典非对称交流电热泵进行改进,提出多种样式具有混合功能的非对称电极交流电热泵．通过COMSOL三维建模,对不同种类的电热泵在不同电压下的输运效率、温度和混合效率进行定性及定量分析,并对其中混合效率最高的交替倾斜偏向电极的角度偏转参数进行讨论．结果表明:几种改进的非对称电极交流电热泵可实现输运与混合双功能,其中倾斜交替偏向电极的混合效率明显优于其他样式;在有限的区域内以25°倾斜度时交替偏向电极的混合效率最高,此时在有效值为7.070 V交流电压下,泵送速度可达69.53 μm/s,比传统无混合功能的非对称交流电热泵速度67.16 μm/s高出3.5％．

Abstract:

To meet the requirements of driving and mixing on the microfluidic devices for chemical analysis, cell culture, and pharmaceutical test, multi types of AC electrothermal pump with mixing function were developed. A three-dimensional model was built for the study on the qualitative analysis for transport and mixing efficiency of the multi types of AC electrothermal pump with different driving voltages. We found that the electrodes with deflection angles have the best mixing efficiency. The results indicate that the new types of the asymmetric electrodes could have both functions of transport and mixing. At the limited size of microchannel, the electrodes with deflection angles of 25° were more outstanding on mixing than any other types, and the type of the electrodes with deflection angles is the best type in mixing efficiency. The velocity of 69.53 μm/s could be driven at the applied voltage of 7.070 V for this type, and it was 3.5％ faster than the velocity of the traditional micropump with asymmetric electrodes (67.16 μm/s).