Interfacial deflection and jetting of a paramagnetic particle-laden fluid: Theory and experiment

Scott S.H. Tsai, Ian M. Griffiths, Zhenzhen Li, Pilnam Kim, Howard A. Stone

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We describe the results of experiments and mathematical analysis of the deformation of a free surface by an aggregate of magnetic particles. The system we study is differentiated from ferrofluid systems because it contains regions rich with magnetic material as well as regions of negligible magnetic content. In our experiments, the magnetic force from a spherical permanent magnet collects magnetic particles to a liquid-air interface, and deforms the free surface to form a hump. The hump is composed of magnetic and non-magnetic regions due to the particle collection. When the magnet distance falls below a threshold value, we observe the transition of the hump to a jet. The mathematical model we develop, which consists of a numerical solution and an asymptotic approximation, captures the shape of the liquid-air interface during the deformation stage and a scaling prediction for the critical magnet distance for the hump to become a jet.

Original languageEnglish (US)
Pages (from-to)8600-8608
Number of pages9
JournalSoft matter
Issue number35
StatePublished - Sep 21 2013

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics


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