Zhang, Shigang;
Han, Yuang;
Lacassagne, Tom;
Cagney, Neil;
Naveira-Cotta, Carolina P;
Balabani, Stavroula;
Tiwari, Manish K;
(2023)
Flow dynamics and mixing past pairs of confined microfluidic cylinders.
Chemical Engineering Science
, 267
, Article 118349. 10.1016/j.ces.2022.118349.
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Abstract
Placing cylindrical obstacles in a micromixer is a promising means to enhance mass transport. However, there is still a lack of fundamental understanding on the effect of obstacle arrangement on the flow. The present work provides new experimental insights into confined inertia flows past two cylindrical pins, placed either in tandem or staggered arrangement in a Y-type micromixer, and their effect on mixing, through micro Particle Image Velocimetry (μPIV) and Laser Induced Fluorescence (μLIF) measurements. It is found that in such confined microfluidic environments, adding a second pin suppresses vortex-shedding for spacings less than 3.5-pin diameters in a tandem arrangement or 0.25-pin diameters in the staggered configurations. Vortex-shedding is found to enhance mixing in tandem configurations but not in staggered ones. The results highlight the important roles of both pin arrangement and flow instabilities in micromixer performance and can serve as a guide to micromixer design.
| Type: | Article |
|---|---|
| Title: | Flow dynamics and mixing past pairs of confined microfluidic cylinders |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.ces.2022.118349 |
| Publisher version: | https://doi.org/10.1016/j.ces.2022.118349 |
| Language: | English |
| Additional information: | Copyright © 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| Keywords: | Fluid mechanics, Micromixing, Tandem arrangement, Staggered arrangement, Micro laser-induced fluorescence (μLIF), Micro particle image velocimetry (μPIV) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10161345 |
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