Lookup NU author(s): Dr Vladimir Zivkovic
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
Micro-fluidized beds represent a novel means of significantly enhancing mixing and mass and heat transfer under the low Reynolds number flows that dominate in microfluidic devices. This study experimentally evaluates the mixing performance of a micro-fluidized bed and the improvements it affords over the equivalent particle-free system. The dye dilution technique coupled with standard top-view image analysis was used to characterize the mixing in a 400 x 175 μm2 polydimethylsiloxane (PDMS) Y-microchannel. Overall, the micro-fluidized bed provided a mixing effectiveness and energetic efficiency of mixing that were up to three times greater than those of a particle-free channel of the same dimensions. The mixing performance is strongly affected by specific power input and bed voidage. The optimal operating voidage, which corresponds to the energetic efficiency of mixing being maximal, is around 0.77 for the smallest particle-to-channel size ratio considered here 0.121, and appears to increase beyond this with size ratio.
Author(s): Zivkovic V, Ridge N, Biggs MJ
Publication type: Article
Publication status: Published
Journal: Applied Thermal Engineering
Print publication date: 25/12/2017
Online publication date: 01/09/2017
Acceptance date: 25/08/2017
Date deposited: 30/08/2017
ISSN (print): 1359-4311
ISSN (electronic): 1873-5606
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