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Intermittent Thermal Convection in Jammed Emulsions.

Francesca Pelusi1, Andrea Scagliarini2,3, Mauro Sbragaglia4

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Heat transfer in jammed emulsions occurs through intermittent "heat bursts" driven by yield-stress rheology. This leads to fluidization-rigidity transitions and eventual sustained convection.

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Area of Science:

  • Rheology
  • Fluid Dynamics
  • Materials Science

Background:

  • Jammed emulsions exhibit complex behaviors under stress.
  • Understanding heat transfer in such systems is crucial for various applications.

Purpose of the Study:

  • To investigate thermal convection in jammed emulsions with yield-stress rheology.
  • To elucidate the mechanism of heat transfer and its relation to emulsion dynamics.

Main Methods:

  • Analysis of thermal convection in yield-stress jammed emulsions.
  • Statistical analysis of droplet-scale dynamics.
  • Characterization of fluidization-rigidity transitions.

Main Results:

  • Heat transfer is intermittent, characterized by short-lived heat bursts and long conductive periods.
  • Emulsion dynamics involve a interplay between yield-stress rheology and plastic activity.
  • Droplet coalescence during heat bursts induces phase inversion, supporting sustained convection.

Conclusions:

  • The study reveals an intermittent heat transfer mechanism in jammed emulsions.
  • Yield-stress rheology and plastic activity drive fluidization-rigidity transitions.
  • Phase inversion via coalescence can lead to sustained convective states.