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Characterization of Exhaust Sensors Through Modeling of Multi- Component Gas Transport and Reaction

机译:通过多组分气体传输和反应建模对排气传感器进行表征

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摘要

Transport and reaction of gas mixtures in porous media are common phenomena in many chemical engineering applications. One common method of modeling the transport processes is to notionally substitute a uniform bundle of tortuous capillaries for the irregular porous structure. Then, accurate equations of motion for the gas flow and diffusion inside these small-sized capillaries can be used. This advantage comes at the cost of two additional parameters that enter into the equations, the tortuosity factor and the equivalent capillary diameter. In this work, an existing model for transient transport of multi-component gas mixtures is expanded to comprise heterogeneous fluid domains and chemical reaction. It can be applied to fluid domains that partially or completely enclose porous regions. The potential of the present model is demonstrated by simulating the electrochemically induced and transport-limited signal formation inside an exhaust gas sensor.
机译:气体混合物在多孔介质中的传输和反应是许多化学工程应用中的常见现象。对运输过程进行建模的一种常用方法是从概念上用均匀的曲折毛细管束代替不规则的多孔结构。然后,可以使用这些小型毛细管内部气体流动和扩散的精确运动方程。此优点的代价是要增加两个附加参数,即曲折系数和等效毛细管直径。在这项工作中,现有的多组分气体混合物瞬态传输模型被扩展为包括非均质流体域和化学反应。它可以应用于部分或完全包围多孔区域的流体域。本模型的潜力通过模拟废气传感器内部的电化学感应和运输受限信号形成来证明。

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