Experimental study of efficient mixing in a micro-fluidized bed

Vladimir Zivkovic*, Nadia Ridge, Mark J. Biggs

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
66 Downloads (Pure)


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 × 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.

Original languageEnglish
Pages (from-to)1642-1649
Number of pages8
JournalApplied Thermal Engineering
Early online date1 Sept 2017
Publication statusPublished - 25 Dec 2017


  • Fluidization
  • Micro-fluidized bed
  • Micro-mixer
  • Mixing efficiency
  • Multiphase flow
  • Process intensification

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering


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