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Design of a Novel Axial Gas Pulses Micromixer and Simulations of its Mixing Abilities via Computational Fluid Dynamics

机译：新型轴向气体脉冲微混合器的设计及其混合能力的计算流体动力学模拟

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摘要

Following the fast development of microfluidics over the last decade, the need for methods for mixing two gases in flow at an overall flow rate ranging from 1 to 100 NmL·min−1 with programmable mixing ratios has been quickly increasing in many fields of application, especially in the calibration of analytical devices such as air pollution sensors. This work investigates numerically the mixing of pure gas pulses at flow rates in the range 1–100 NmL·min−1 in a newly designed multi-stage and modular micromixer composed of 4 buffer tanks of 300 µL each per stage. Results indicate that, for a 1 s pulse of pure gas (formaldehyde) followed by a 9 s pulse of pure carrier gas (air), that is a pulses ratio of 1/10, an effective mixing up to 94–96% can be readily obtained at the exit of the micromixer. This is achieved in less than 20 s for any flow rate ranging from 1 to 100 NmL·min−1 simply by adjusting the number of stages, 1 to 16 respectively. By using an already diluted gas bottle containing 100 ppm of a given compound in an inert gas same as the carrier gas, concentrations ranging from 10 to 90 ppm should be obtained by adjusting the pulses ratio between 1/10 and 9/10 respectively.
机译：随着近十年来微流体技术的快速发展，人们急需一种以可编程的混合比将总流量为1至100 NmL·min -1 的两种气体混合的方法在许多应用领域中，尤其是在分析设备（例如空气污染传感器）的校准方面，这一趋势正在不断增加。这项工作是在一个新设计的多级模块化微型混合器中对纯气体脉冲在1–100 NmL·min -1 范围内的流量进行混合的数值研究，该混合器由4个每个300 µL的缓冲罐组成每个阶段。结果表明，对于纯气体（甲醛）1 s脉冲，然后纯载气（空气）9 s脉冲，即脉冲比为1/10，有效混合率可达94–96％在微型混合器的出口很容易获得。对于1到100 NmL·min -1 范围内的任何流量，只需调整级数（分别为1到16）即可在不到20 s的时间内实现。通过使用已经稀释的气瓶，该气瓶在与载气相同的惰性气体中包含100 ppm的给定化合物，应通过分别在1/10和9/10之间调节脉冲比来获得10至90 ppm的浓度。

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