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MODELLING TRANSPORT LIMITED HETEROGENEOUS CHEMISTRY IN MICROCHANNEL REACTORSq

机译:在微通道反应器中模拟运输受限的异质化学

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摘要

Enhancing radial mixing in microchannel processing of two phase flows for is important so that this feature can be exploited to simplify the design of heterogeneous reaction schemes in microchannel processing. The asymptotic analysis here extends the concept of the Thiele modulus to be the controlling variable in non-uniform systems. We argue that a generalization of a Thiele modulus is the ratio of the time scale for the limiting transport step to the time scale for surface reaction. If the intrinsic kinetics are fast and the reaction nearly irreversible, the latter is actually controlled by mass transfer to the reacting phase. Our analysis methodology naturally identifies the Thiele moduli and reduces the order of the system so that analytic, closed form estimates of the reaction dynamics are found. For parametric optimization, such a form is a good guide. The applicability of this general methodology is argued for microchannel processing and supported by several published studies and experiments.
机译:对于两相流的微通道处理而言,增强径向混合非常重要,因此可以利用此功能来简化微通道处理中异质反应方案的设计。这里的渐近分析将Thiele模量的概念扩展为非均匀系统中的控制变量。我们认为,Thiele模量的一般化是极限传输步骤的时间尺度与表面反应的时间尺度之比。如果内在动力学很快并且反应几乎不可逆,则后者实际上是通过向反应相的传质来控制的。我们的分析方法自然地识别了Thiele模量,并降低了系统的阶数,因此可以找到反应动力学的解析,闭合形式估计。对于参数优化,这种形式是一个很好的指南。这种通用方法的适用性被认为适用于微通道处理,并得到了一些已发表的研究和实验的支持。

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