微型流动注射分析系统理论研究
首发时间:2012-03-13
摘要:通过有限元方法研究了流动注射分析系统(FIA)微型化对流体传质与反应的影响。所建立的理论模型是基于重力驱动的微型流动注射分析系统。鉴于该系统的多尺度特性,采用不同尺度的网格划分模型以减小计算量。理论模拟研究了扩散对微型流动注射分析系统中物质混合的影响,确认了Taylor扩散在该系统的物质传质中占主导地位。同时,也运用理论模型研究了Taylor扩散对非平衡条件下准一级反应动力学过程的影响。随着反应速率常数的增加,准一级反应产物的浓度分布曲线的峰高降低。另外,理论模拟得到流速和进样体积对微型流动注射分析系统的影响和文献报道的结果一致。因此,借助有限元模型将有助于理解微型化流动注射分析系统的传质机制和设计优化微型流动注射分析系统的构型。
关键词: 微型流动注射分析 有限元 Taylor扩散 反应动力学 混合
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Development of a Finite Element Model for Micro Flow Injection Analysis Based on High Throughput Sample Introduction
Abstract:A finite element method (FEM) was developed for micro-flow analysis system (FIA) based on the gravity driving. For reducing the computation burden, the numerical model built on the manifold of micro-FIA was meshed in different scale. The simulation evaluated the effect of diffusion on the mixing in the micro-FIA system and demonstrated that the Taylor dispersion predominated in the micro-FIA system. For simplicity, the pseudo-first-order chemical kinetic was applied into the model for studying contribution of chemical kinetic to dispersion under nonequilibrium conditions. With the rate coefficient increasing, the concentration profiles of product in pseudo-first-order reaction decrease. In addition, the effect of velocity and injection volume was simulated in the numerical model. Its results have agreement with our published results. The FEM model can facilitate understanding the mechanism in micro-FIA and optimize the manifold of micro-FIA system.
Keywords: Micro Flow Injection Analysis, Finite Element Method, Taylor Dispersion, Kinetic, Mix
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