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      Thermally controlled droplet formation in flow focusing geometry : formation regimes and effect of nanoparticle suspension

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      JPhysDPaper.pdf (1018.Kb)
      Author
      Tan, Say-Hwa
      Murshed, S. M. Sohel
      Nguyen, Nam-Trung
      Wong, Teck Neng
      Yobas, Levent
      Date of Issue
      2008
      School
      School of Mechanical and Aerospace Engineering
      Version
      Accepted version
      Abstract
      This paper reports experimental investigations on the droplet formation of deionized water and a nanofluid in a heat-induced microfluidic flow focusing device. Besides the effect of temperature, the effects of nanoparticle suspension (nanofluid) and the flow rate of aqueous fluid on the droplet formation and size manipulation were studied. At constant flow rates of the two liquids, three different droplet breakup regimes were observed and their transition capillary numbers as well as temperatures were identified. The heat generated by an integrated microheater changes the droplet formation process. Increasing the temperature enlarges the size of the droplets significantly. These results also demonstrate that the titanium oxide (15 nm)/deionized water-based nanofluid exhibits similar characteristics in droplet formation at different temperatures and any small change in the flow rate of this nanofluid has little impact on the size of the droplets formed in a flow focusing geometry.
      Subject
      DRNTU::Engineering::Mechanical engineering
      Type
      Journal Article
      Series/Journal Title
      Journal of physics D: applied physics
      Rights
      © 2008 IOP Publishing Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Physics D: Applied Physics, IOP Publishing Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: DOI: [http://dx.doi.org.ezlibproxy1.ntu.edu.sg/10.1088/0022-3727/41/16/165501].
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      http://dx.doi.org.ezlibproxy1.ntu.edu.sg/10.1088/0022-3727/41/16/165501
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