Effect of dispersion on the diffusion zone in two-phase laminar flows in microchannels
| Autor: | Sunando DasGupta, Tapas K. Maiti, Nilanjana Bose, Swagata Dasgupta, Sukanya Sasmal, Debapriya Chakraborty, Suman Chakraborty |
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| Rok vydání: | 2011 |
| Předmět: |
Chemistry
Schmidt number Taylor dispersion Mass diffusivity Analytical chemistry Water Laminar flow Péclet number Mechanics DNA Microfluidic Analytical Techniques Models Theoretical Thermal diffusivity Biochemistry Analytical Chemistry Physics::Fluid Dynamics Diffusion Solutions symbols.namesake Ethidium symbols Environmental Chemistry Diffusion (business) Dispersion (chemistry) Spectroscopy |
| Zdroj: | Analytica chimica acta. 710 |
| ISSN: | 1873-4324 |
| Popis: | Aim of the present work is to investigate the reaction–diffusion process of a two species system under laminar flow in a T-shaped microchannel. A zone formed at the interface between the aqueous solutions of these two species is affected by advection and diffusion. Through theoretical analyses and experimental results, the effect of dispersion has been shown to influence this diffusion zone. We have defined a parameter called effective diffusivity, to account for the dispersion effects and observed it to be a function of the channel Peclet number. In the limiting case of low Peclet number, this parameter is constant and turns out to be equal to the molecular diffusivity. We have also related effective diffusivity and the dispersion coefficient through scaling estimates. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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