Numerical and experimental investigations of the formation process of ferrofluid droplets

Jing Liu, Say Hwa Tan, Yit Fatt Yap, Min Yuan Ng, Nam Trung Nguyen

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

This paper reports both experimental and numerical investigations of the formation process of ferrofluid droplets in a flow focusing configuration with and without an applied magnetic field. In the experiment, the homogenous magnetic field was generated using an electromagnet. The magnetic field in the flow direction affects the formation process and changes the size of the droplets. The change in the droplet size depends on the magnetic field strength and the flow rates. A numerical model was used to investigate the force balance during the droplet breakup process. A linearly magnetizable fluid was assumed. Particle level set method was employed to capture the interface movement between the continuous fluid and the dispersed fluid. Results of the droplet formation process and the flow field are discussed for both cases with and without the magnetic field. Finally, experimental and numerical results are compared.

Original languageBritish English
Pages (from-to)177-187
Number of pages11
JournalMicrofluidics and Nanofluidics
Volume11
Issue number2
DOIs
StatePublished - Aug 2011

Keywords

  • Ferrofluid
  • Flow focusing
  • Magnetic field
  • Microfluidic

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