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Effect of microchannel aspect ratio on residence time distributions and the axial dispersion coefficient

Aubin, Joelle and Prat, Laurent E. and Xuereb, Catherine and Gourdon, Christophe Effect of microchannel aspect ratio on residence time distributions and the axial dispersion coefficient. (2009) Chemical Engineering and Processing: Process Intensification, vol. 4 (n° 1). pp. 554-559. ISSN 0255-2701

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Official URL: http://dx.doi.org/10.1016/j.cep.2008.08.004

Abstract

The effect of microchannel aspect ratio (channel depth/channel width) on residence time distributions and the axial dispersion coefficient have been investigated for Newtonian and shear thinning non-Newtonian flow using computational fluid dynamics. The results reveal that for a fixed cross sectional area and throughput, there is a narrowing of the residence time distribution as the aspect ratio decreases. This is quantified by an axial dispersion coefficient that increases rapidly for aspect ratios less than 0.3 and then tends towards an asymptote as the aspect ratio goes to 1. The results also show that the axial dispersion coefficient is related linearly to the Reynolds number when either the aspect ratio or the mean fluid velocity is varied. However, the fluid Péclet number is a linear function of the Reynolds number only when the aspect ratio (and therefore hydraulic diameter) is varied. Globally, the results indicate that microchannels should be designed with low aspect ratios (≤ 0.3) for reduced axial dispersion.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com Chemical Engineering and Processing homepage : http://www.elsevier.com/wps/find/journaldescription.cws_home/504081/description#description
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Réaction, mélange & séparation (RMS)
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Deposited By:Joelle Aubin-cano

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