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Drop formation in shear-thickening granular suspensions.

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Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
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Researchers investigated droplet formation in granular suspensions, discovering three distinct regimes based on particle concentration. Dilute suspensions behave like pure water, while concentrated suspensions reveal new inertial and Bagnoldian breakup dynamics.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Rheology

Background:

  • Droplet formation is crucial in various industrial processes.
  • Understanding granular suspensions' behavior is complex due to particle interactions.

Purpose of the Study:

  • To investigate droplet formation dynamics in granular suspensions.
  • To identify and characterize different breakup regimes based on particle volume fraction and diameter.

Main Methods:

  • Systematic variation of volume fractions (φ) and particle diameters (d).
  • Experimental observation of droplet formation in water-based granular suspensions.
  • Analysis of breakup dynamics, including symmetry and inertial effects.

Main Results:

  • Identified three distinct droplet formation regimes.
  • Dilute suspensions (φ≤45%) exhibit inertial breakup dynamics similar to pure water with asymmetrical breakup.
  • Concentrated suspensions (φ>45%) show a symmetrical inertial regime and a Bagnoldian regime.

Conclusions:

  • Particle presence significantly alters droplet breakup dynamics in concentrated suspensions.
  • A phase diagram was developed to predict breakup behavior in granular suspensions.
  • Findings provide insights into controlling droplet formation in multiphase flows.