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Area of Science:

  • Fluid dynamics
  • Particle aggregation
  • Rheology

Background:

  • Understanding particle behavior in flow is crucial for industrial processes.
  • Polystyrene agglomerates are common in various applications.
  • Previous studies have not fully explored agglomerate breakup in pure planar extensional flow.

Purpose of the Study:

  • To experimentally investigate the deformation and breakup of single polystyrene agglomerates.
  • To determine the influence of extensional flow on agglomerate morphology and stability.
  • To analyze the relationship between applied stress and fragment characteristics.

Main Methods:

  • Generating polystyrene agglomerates using shear flow.
  • Subjecting single agglomerates to pure planar extensional flow in a cross-channel.
  • Analyzing agglomerate deformation, breakup probability, and fragment size distribution.
  • Measuring fractal dimension (df = 2.25) and aspect ratio changes.

Main Results:

  • Agglomerate aspect ratio increased upon approaching the flow's stagnant point.
  • Breakup probability and fragment distribution followed a master curve dependent on applied stress.
  • Fragment projected area decreased with increasing stress, exhibiting a power-law relationship.

Conclusions:

  • The study provides insights into the mechanics of agglomerate breakup under extensional flow.
  • The findings suggest that applied stress is a key parameter governing fragment size.
  • The observed power-law relationship supports theoretical models for flow-induced breakup.