Stability Analysis of Reactive Multiphase Slug Flows in Microchannels
Stability Analysis of Reactive Multiphase Slug Flows in Microchannels
复制标题
微通道中反应性多相段塞流的稳定性分析
DOI：
10.3390/pr2020371
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发表时间：
2014
影响因子：
4.7
通讯作者：
D. Agar
中科院分区：
文献类型：
--
作者：
Alejandro A. Munera Parra;Nicolai Antweiler;Rachita Nagpal;D. Agar
在微反应器中进行多相反应是强化化学和生物化学过程的一种很有前途的策略。一个尚未解决的主要挑战是通过增加数量来利用微型操作为工业规模吞吐量提供的可观优势，同时保留多个平行通道中单通道系统的潜在有利流动特征。各个微通道中的制造和安装公差导致不同的压力损失，从而导致流体分布不均。在这项工作中，一个额外的来源不均匀，即流动的多重性，这可能会出现在一个多相反应或提取流在其他相同的微通道，进行了研究。本文对气-液弹状流和液-液弹状流在有反应和无反应情况下的流动稳定性进行了详细的实验和理论分析。用离子液体1-乙基-3-甲基咪唑乙基硫酸盐萃取正庚烷中的乙酸，对模型进行了验证。结果清楚地表明，流动结构之间的耦合，反应/提取和压降的程度可以导致多个操作状态，因此，需要一个积极的测量和控制的概念，以确保统一的行为和最佳性能。
Conducting multiphase reactions in micro-reactors is a promising strategy for intensifying chemical and biochemical processes. A major unresolved challenge is to exploit the considerable benefits offered by micro-scale operation for industrial scale throughputs by numbering-up whilst retaining the underlying advantageous flow characteristics of the single channel system in multiple parallel channels. Fabrication and installation tolerances in the individual micro-channels result in different pressure losses and, thus, a fluid maldistribution. In this work, an additional source of maldistribution, namely the flow multiplicities, which can arise in a multiphase reactive or extractive flow in otherwise identical micro-channels, was investigated. A detailed experimental and theoretical analysis of the flow stability with and without reaction for both gas-liquid and liquid-liquid slug flow has been developed. The model has been validated using the extraction of acetic acid from n-heptane with the ionic liquid 1-Ethyl-3-methylimidazolium ethyl sulfate. The results clearly demonstrate that the coupling between flow structure, the extent of reaction/extraction and pressure drop can result in multiple operating states, thus, necessitating an active measurement and control concept to ensure uniform behavior and optimal performance.