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Area of Science:

  • Materials Science
  • Polymer Engineering
  • Acoustics

Background:

  • Nanoparticle dispersion in polymer melts is critical for composite materials.
  • Conventional extrusion struggles with mixing in high-viscosity polymers.
  • Ultrasound effectively disperses nanoparticles in low-viscosity fluids via cavitation and acoustic streaming.

Purpose of the Study:

  • To investigate ultrasound-induced flow and acoustic streaming in polydimethylsiloxane (PDMS) melts of varying viscosities.
  • To understand the influence of dissolved gases and viscosity on ultrasound-driven fluid dynamics in polymers.
  • To identify key parameters for developing ultrasound-assisted polymer processing.

Main Methods:

  • Utilized flow visualization techniques.
  • Employed Particle Image Velocimetry (PIV) to quantify velocity fields.
  • Tested PDMS samples with viscosities of 5, 30, and 300 Pa·s under degassed and non-degassed conditions.

Main Results:

  • Non-degassed samples showed significantly enhanced acoustic streaming (up to 20 mm/s) due to dense bubble clouds.
  • Degassing reduced velocities (3–6 mm/s) and stabilized flow patterns.
  • Very high viscosity (300 Pa·s) drastically reduced velocities, indicating viscosity-dependent attenuation and limited bubble formation.

Conclusions:

  • Dissolved gases play a crucial role in amplifying acoustic streaming in viscous polymer melts.
  • High melt viscosity and gas content are critical factors influencing ultrasound-induced flow.
  • Findings provide insights for optimizing ultrasound-assisted extrusion processes for nanocomposite fabrication.