Experiments on breakups of a magnetic fluid drop through a micro-orifice

Ching-Yao Chen*, C. H. Chen, W. F. Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We experimentally study the breakups of a ferrofluid drop passing through a narrow passage under the attraction of an external field. After passing through the orifice, the fluid thread starts to neck down significantly and eventually breaks to form new droplets. The dynamics of the ferrofluid breakup are analyzed parametrically, including the diameter of the orifice and the local field strength. The patterns of fluid breakups can be characterized by two measurements of the breaking droplets, such as their sizes and stretching lengths. These two characteristic measurements mainly depend on the diameter of the orifice. Breaking droplets with less stretching and smaller sizes are resulted from a narrower orifice. On the other hand, the number of total breaking droplets that represents the transport effectiveness of ferrofluids significantly depends on both the diameter of the orifice and the local field strength. While a stronger field generates more breaking droplets, a maximum number of breaking droplets occurs at an intermediate orifice's diameter.

Original languageEnglish
Pages (from-to)3520-3525
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number20
DOIs
StatePublished - 1 Oct 2009

Keywords

  • Drop breakup
  • Ferrofluid
  • Surface tension

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