Shaping of sessile magnetic drops due to electromagnetic stress

Jennifer Dodoo, Glen McHale, Adam A. Stokes

Research output: Working paper

Abstract

While electric fields have been widely studied for drop shaping and digital microfluidics, a unified electromagnetic approach inclusive of magnetic fields is by far less known. Here using the electromagnetic stress tensor, we derive the stress acting on a droplet and test the results experimentally by measuring the shape of a paramagnetic drop in a magnetic field. We show through a simple transformation that our model can be applied to shaping of droplets by electric fields, thus giving a holistic description of the electromagnetic stresses acting on drops. This provides a blueprint for controlled shaping of sessile magnetic drops and has application to magnetic technologies in displays, liquid lenses, and chemical mixing of drops in microfluidics.
Original languageEnglish
PublisherArXiv
Publication statusPublished - 14 Aug 2019

Keywords

  • physics.app-ph

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