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Microfluidic Rheometry and Particle Settling: Characterizing the Effect of Polymer Solution Elasticity.

Salah A Faroughi1, Francesco Del Giudice2

  • 1Geo-Intelligence Laboratory, Ingram School of Engineering, Texas State University, San Marcos, TX 78666, USA.

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|February 26, 2022
PubMed
Summary
This summary is machine-generated.

This study quantifies how fluid elasticity affects particle transport. Higher elasticity enhances particle drag, improving carrying capacity in industrial applications.

Keywords:
Oldroyd-B modeldilute polymeric solutionsdrag coefficienthydraulic fracturingmicrofluidic rheometryparticle settlingviscoelasticity

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Area of Science:

  • Rheology and Fluid Dynamics
  • Polymer Science
  • Particle Transport

Background:

  • Efficient particle transport in polymeric fluids is crucial for industrial processes.
  • The role of fluid elasticity in particle carrying capacity remains underexplored.
  • Viscoelastic fluids offer potential for enhanced particle transport.

Purpose of the Study:

  • To experimentally investigate the influence of fluid elasticity on particle drag coefficient.
  • To establish a proxy for measuring the particle-carrying capacity of viscoelastic fluids.
  • To provide a unique dataset for moderate Weissenberg numbers (0

Main Methods:

  • Utilized two elastic fluid formulations with distinct relaxation times and constant shear viscosity.
  • Employed microfluidic rheometry for accurate relaxation time determination (milliseconds).
  • Used a calibrated experimental setup with advanced particle velocity measurement techniques and varied sphere characteristics.

Main Results:

  • Observed a subtle reduction in drag coefficient at low elasticity (Wi<1).
  • Demonstrated a considerable enhancement in drag coefficient at high elasticity (Wi>1).
  • Experimental data showed strong agreement with direct numerical simulations (R²=0.982).

Conclusions:

  • Fluid elasticity significantly impacts particle drag and carrying capacity.
  • The findings support the use of numerical simulations for comparing fluid performance.
  • This research provides a foundation for designing optimized polymeric fluids for particle transport.