A co-flow-focusing monodisperse microbubble generator

Jiaming Zhang, Erqiang Li, Sigurdur T Thoroddsen

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


We use a simple and inexpensive microfluidic device, which is based on microscope glass slides and two tapered glass capillaries, to produce monodisperse microbubbles. The innermost capillary used for transporting the gas is inserted into the second capillary, with its 2 μm sharp tip aligned with the center of the converging-diverging throat of the second capillary. This configuration provides a small and smooth gas flow rate, and a high velocity gradient at the tube outlet. Highly monodisperse microbubbles with diameters ranging from 3.5 to 60 microns have been successfully produced at a rate of up to 40 kHz. A simple scaling law, which is based on the capillary number and liquid-to-gas flow rate ratio, successfully predicts the bubble size. © 2014 IOP Publishing Ltd.
Original languageEnglish (US)
Pages (from-to)035008
JournalJournal of Micromechanics and Microengineering
Issue number3
StatePublished - Feb 14 2014

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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