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Multiscale flow in an electro-hydrodynamically driven oil-in-oil emulsion.

Atul Varshney1, Smita Gohil, Mayur Sathe

  • 1Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel. atul.varshney@weizmann.ac.il.

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Summary

This study reveals a new electro-hydrodynamic flow in viscous emulsions, creating large-scale structures and efficient mixing. The findings show scale-invariant energy spectra, similar to turbulent convection, in micro-scale systems.

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Area of Science:

  • Fluid dynamics
  • Rheology
  • Soft matter physics

Background:

  • Efficient mixing in viscous fluids is challenging due to suppressed multi-scale flows.
  • Highly viscous systems often hinder the generation of complex flow patterns necessary for effective mixing.

Purpose of the Study:

  • To investigate a novel multi-scale flow driven by an external electric field in a highly viscous oil-in-oil emulsion.
  • To characterize the dynamics and scale invariance of electro-hydrodynamic flows in micro-scale systems.
  • To demonstrate the mixing efficiency achieved through these induced flows.

Main Methods:

  • Utilized a highly viscous oil-in-oil emulsion with micron-size droplets.
  • Applied an external electric field to induce electro-hydrodynamic flow.
  • Measured bulk Reynolds stress using a rheometer.
  • Performed micro-scale rheometric measurements via fiber cantilever fluctuation spectrum analysis.

Main Results:

  • Observed dynamical organization at scales larger than individual droplets.
  • Demonstrated scale invariance in energy spectra over three decades.
  • Identified a power law in energy spectra similar to turbulent convection.
  • Confirmed efficient mixing capabilities in the micro-scale system.

Conclusions:

  • External electric fields can generate novel multi-scale flows in highly viscous emulsions.
  • These electro-hydrodynamic flows exhibit scale-invariant properties analogous to turbulence.
  • The study demonstrates a promising method for efficient mixing in micro-scale viscous systems.