微流道中混合增强与周期性电渗流下的收缩相结合。
Mixing enhancement in microfluidic channel with a constriction under periodic electro-osmotic flow.
机构信息
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Nanyang Avenue 50, Singapore 639798, Singapore.
出版信息
Biomicrofluidics. 2010 Jan 7;4(1):14101. doi: 10.1063/1.3279790.
We present a new approach to enhance mixing in T-type micromixers by introducing a constriction in the microchannel under periodic electro-osmotic flow. Two sinusoidal ac electric fields with 180 degrees phase difference and similar dc bias are applied at the two inlets. The out of phase ac electric field induces oscillation of fluid interface at the junction of the two inlet channels and the constriction. Due to the constriction introduced at the junction, fluids from these two inlets form alternative plugs at the constricted channel. These plugs of fluids radiate downstream from the constriction into the large channel and form alternate thin crescent-shaped layers of fluids. These crescent-shaped layers of fluids increase tremendously the contact surface area between the two streams of fluid and thus enhance significantly the mixing efficiency. Experimental results and mixing mechanism analysis show that amplitude and frequency of the ac electric field and the length of the constriction govern the mixing efficiency.
我们提出了一种新的方法，通过在周期性电渗流下的微通道中引入收缩来增强 T 型微混合器中的混合。在两个入口处施加具有 180 度相位差和相似直流偏置的两个正弦交流电场。相反的交流电场会在两个入口通道和收缩处的交界处引起流体界面的振荡。由于在交界处引入了收缩，来自这两个入口的流体在收缩通道中形成交替的塞子。这些流体塞从收缩处向下游辐射到较大的通道中，并形成交替的薄新月形流体层。这些新月形流体层大大增加了两种流体之间的接触表面积，从而显著提高了混合效率。实验结果和混合机理分析表明，交流电场的振幅和频率以及收缩的长度控制着混合效率。
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