کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1163914 1490994 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical modeling of surface reaction kinetics in electrokinetically actuated microfluidic devices
ترجمه فارسی عنوان
مدل سازی عددی سینتیک واکنش سطحی در دستگاه های میکرولیتیک فعال الکتروکینتیک
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• Surface reactions in electrokinetically actuated microfluidic devices are studied.
• Governing equations are solved using a finite difference based numerical procedure.
• A concentration wave is observed for sufficiently long microchannels.
• Modeling a reactor as a slit leads to an underestimation of the saturation time.

We outline a comprehensive numerical procedure for modeling of species transport and surface reaction kinetics in electrokinetically actuated microfluidic devices of rectangular cross section. Our results confirm the findings of previous simplified approaches that a concentration wave is created for sufficiently long microreactors. An analytical solution, developed for the wave propagation speed, shows that, when normalizing with the fluid mean velocity, it becomes a function of three parameters comprising the channel aspect ratio, the relative adsorption capacity, and the kinetic equilibrium constant. Our studies also reveal that the reactor geometry idealized as a slit, instead of a rectangular shape, gives rise to the underestimation of the saturation time. The extent of this underestimation increases by increasing the Damkohler number or decreasing the dimensionless Debye–Hückel parameter. Moreover, increasing the values of the Damkohler number, the dimensionless Debye–Hückel parameter, the relative adsorption capacity, and the velocity scale ratio results in lower saturation times.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 838, 1 August 2014, Pages 64–75
نویسندگان
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