基于小型电磁动力驱动器的微流道混合控制研究

Mixing in micro channel by a mini electro magneto hydrodynamic stirrer

对于许多微流体应用系统来说,流体的混合是至关重要的。本文研究了基于电磁流体动力混合器的微流道主动混合控制方法,建立了该微流道混合系统的理论模型并进行了数值模拟。在交变Lorentz驱动下,流经混合器流道的流体及其分界面在混合器流道内往复运动,流体界面的反复折叠与流体局部流动使流体混合,流体的横向往复运动使流体分界面反复折叠从而使流体间的接触面积大大增加。对流体混合过程进行了讨论并给出了流体混合程度评价方法。

Mixing is important and critical for most microfluidic devices. An active mixing method based on an electro magneto hydrodynamic stirrer studied for mixing control in micro channel theoretically and numerically. A mixing chamber is used for the microehannel flow mixing. The dynamic Lorentz force acted on the fluids causes them to move back and forth periodically in the chamber. The periodically changed velocity causes the interface between fluids folded and the interracial areas increase dramatically. The repeat movement and the folding of the interface make the fluids mixed. The mixing process was discussed and the mixing performance was evaluated.