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Theoretical and experimental characterization of a low-Reynolds number split-and-recombine mixer

Hardt, Steffen and Pennemann, H. and Schönfeld, F. (2006):
Theoretical and experimental characterization of a low-Reynolds number split-and-recombine mixer.
In: Microfluidics and Nanofluidics, pp. 237-248, 2, (3), ISSN 1613-4982,
[Online-Edition: http://dx.doi.org/10.1007/s10404-005-0071-6],
[Article]

Abstract

A mixing device based on the split-and-recombine (SAR) principle is characterized using both theoretical and experimental methods. The theoretical model relies on solving a 1D diffusion equation in a frame of reference comoving with the flow, thus avoiding the usual numerical artefacts related to the prediction of high-Péclet number mixing. It accounts both for the hydrodynamic focusing of the flow inside the mixing channel and the nontrivial flow topology. The experimental technique used for quantifying the degree of mixing utilizes two initially transparent salt solutions that form a colored compound in a fast chemical reaction. The degree of mixing is derived from the average color saturation found at specific positions along the mixing channel. The data obtained from the theoretical model are in reasonable agreement with the experiments and underline the excellent performance of the SAR mixer, with a mixing length growing only logarithmically as a function of Péclet number.

Item Type: Article
Erschienen: 2006
Creators: Hardt, Steffen and Pennemann, H. and Schönfeld, F.
Title: Theoretical and experimental characterization of a low-Reynolds number split-and-recombine mixer
Language: English
Abstract:

A mixing device based on the split-and-recombine (SAR) principle is characterized using both theoretical and experimental methods. The theoretical model relies on solving a 1D diffusion equation in a frame of reference comoving with the flow, thus avoiding the usual numerical artefacts related to the prediction of high-Péclet number mixing. It accounts both for the hydrodynamic focusing of the flow inside the mixing channel and the nontrivial flow topology. The experimental technique used for quantifying the degree of mixing utilizes two initially transparent salt solutions that form a colored compound in a fast chemical reaction. The degree of mixing is derived from the average color saturation found at specific positions along the mixing channel. The data obtained from the theoretical model are in reasonable agreement with the experiments and underline the excellent performance of the SAR mixer, with a mixing length growing only logarithmically as a function of Péclet number.

Journal or Publication Title: Microfluidics and Nanofluidics
Volume: 2
Number: 3
Uncontrolled Keywords: Micromixer;Mixing model;Mixing characterization
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Zentrale Einrichtungen
16 Department of Mechanical Engineering > Institute for Nano- and Microfluidics (NMF)
Date Deposited: 12 Apr 2011 11:55
Official URL: http://dx.doi.org/10.1007/s10404-005-0071-6
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