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Modelling of T-Junction Droplet Generator in the Transition Regime

[+] Author Affiliations
Tomasz Glawdel, Caglar Elbuken, Carolyn Ren

University of Waterloo, Waterloo, ON, Canada

Paper No. IMECE2010-38640, pp. 755-757; 3 pages
doi:10.1115/IMECE2010-38640
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 10: Micro and Nano Systems
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4447-2
  • Copyright © 2010 by ASME

abstract

One of the most commonly used microfluidic droplet generator designs is the T-junction as shown in Figure 1. In this design, the dispersed phase microchannel, usually containing an aqueous solution, perpendicularly intersects the main channel, which contains the continuous phase (oil). The T-junction design has been widely adopted because of its simplicity and the superior control it offers over droplet size. Two primary operational regimes have been identified where breakup is dominated by confinement of the emerging droplet within the microchannel, known as the squeezing regime (Ca<0.002), or by the balance of shear and surface tension forces known as the dripping regime (Ca>0.02). The operational mode of the T-junction generator is primarily characterized by the Capillary number (Ca = μU / γ), which describes the competition between the aforementioned forces. In between the two regimes exists the transition regime where both confinement and shear forces are important.

Copyright © 2010 by ASME

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