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Cavitation Rheology of Model Yield Stress Fluids Based on Carbopol.

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This study introduces a novel needle-induced cavitation (NIC) technique to measure the surface tension of yield stress fluids like Carbopol gels. The method successfully determined surface tension and mechanical properties, overcoming limitations of traditional tensiometry.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Rheology

Background:

  • Traditional tensiometry methods face challenges in accurately measuring the surface tension of yield stress fluids.
  • Yield stress fluids, such as Carbopol gels, exhibit complex rheological behaviors that complicate surface tension measurements.

Purpose of the Study:

  • To overcome the limitations of traditional techniques for measuring the surface tension of yield stress fluids.
  • To introduce and validate a needle-induced cavitation (NIC) technique for characterizing these complex fluids.
  • To investigate the relationship between surface tension, rheology, and mechanical properties of yield stress fluids.

Main Methods:

  • Development and application of a needle-induced cavitation (NIC) technique.
  • Measurement of surface tension for Carbopol gels.
  • Characterization of mechanical properties, including Young's modulus.
  • Time-resolved flow structure analysis around the cavitation cavity.

Main Results:

  • The needle-induced cavitation (NIC) technique successfully measured the surface tension of Carbopol gels at approximately 70 ± 3 mN/m.
  • Surface tension was found to be independent of yield stress over a broad range (0.5-120 Pa).
  • Young's modulus values below 1 kPa were measurable using the NIC method.
  • Analysis revealed distinct flow behaviors around the cavity before and after the cavitation critical point, influenced by fluid rheology.

Conclusions:

  • The needle-induced cavitation (NIC) technique offers a robust method for measuring surface tension and mechanical properties of yield stress fluids.
  • The measured surface tension values represent near-equilibrium properties, unaffected by the fluid's yield stress.
  • The study provides insights into the complex flow dynamics of yield stress fluids during cavitation.