Non-Newtonian fluids in the Faraday system

Corn starch hole & finger

A Newtonian fluid subjected to parametric excitations develops wave patterns first described by Faraday. These waves are parametric excitations of waves a liquid surface can sustain. We study non-Newtonian fluids in the Faraday system, namely particulate suspensions, worm-like micellar solutions, emulsion. We find that these sustain a variety of soliton-like excitations (see example), and propose a theory of these based on hysteresis of the rheological properties and the ability of these fluids to sustain normal stresses.

Publications

  1. C. Falcon, J. Bruggemann, M. Pasquali and R. D. Deegan, "Localized structures in vibrated emulsions", Europhysics Letters 98, 24002 (2012)
  2. T. Epstein & R.D. Deegan, "Strip waves in Vibrated Shear-thickening Worm-Like Micellar Solutions ", Phys. Rev. E. 81, 066310 (2010). See also Kaleidoscope Images
  3. R.D. Deegan, "Stress hysteresis as the cause of persistent holes in particulate suspensions", Phys. Rev. E. 81, 036319 (2010)
  4. F. Merkt, R.D. Deegan, D. Goldman, E. Rericha, & H.L. Swinney, “Persistent holes in a fluid”, Phys. Rev. Lett. 92184501 (2004)