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Detachment forces during parallel-plate gap separation mediated by a simple yield-stress fluid.

Vítor Hugo de Oliveira Pereira1, Wilson Barros2

  • 1Departamento de Física, Universidade Federal de Pernambuco (UFPE), Cidade Universitária, 50670-901, Recife, Pernambuco, Brazil.

The European Physical Journal. E, Soft Matter
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PubMed
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This study reveals how yield-stress fluids behave under traction, showing instability at small gaps and stable flow at larger ones. We isolated viscosity, capillarity, and yield stress contributions to traction force.

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Area of Science:

  • Fluid mechanics
  • Rheology
  • Soft matter physics

Background:

  • Yield-stress fluids exhibit complex flow behaviors.
  • Understanding traction forces is crucial for industrial applications.

Purpose of the Study:

  • To monitor and analyze the normal traction force response of yield-stress fluids.
  • To investigate the influence of confinement geometry and initial gap on fluid behavior.
  • To differentiate and quantify contributions of viscosity, capillarity, and yield stress to traction force.

Main Methods:

  • Experimental setup involving two circular parallel plates separated at constant velocity.
  • Visual inspection for Saffman-Taylor instability and fingering patterns.
  • Application of the Herschel-Bulkley model to analyze traction force scaling.

Main Results:

  • Saffman-Taylor instability observed at narrow initial gaps, characterized by fingering patterns.
  • Stable circular symmetry maintained at larger initial gaps, indicating absence of instability.
  • Cascade of traction force contributions allowed isolation of viscosity, capillarity, and yield stress effects.

Conclusions:

  • The study successfully isolated and quantified individual force contributions in yield-stress fluids.
  • Instability is a key factor influencing fluid behavior and traction forces at small scales.
  • The Herschel-Bulkley model effectively describes traction force scaling across different regimes.