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Persistent holes in a fluid.

Florian S Merkt1, Robert D Deegan, Daniel I Goldman

  • 1Center for Nonlinear Dynamics, The University of Texas at Austin, Austin, TX 78712, USA.

Physical Review Letters
|June 1, 2004
PubMed
Summary
This summary is machine-generated.

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Stable holes form in oscillated cornstarch suspensions above 10g acceleration. These persistent structures exhibit unique instabilities and delocalization at higher forces, also observed in glass microsphere suspensions.

Area of Science:

  • Physics
  • Fluid Dynamics
  • Material Science

Background:

  • Aqueous suspensions exhibit complex behaviors under external forces.
  • Understanding non-Newtonian fluid dynamics is crucial for various industrial applications.

Purpose of the Study:

  • To investigate the formation and stability of holes in vertically oscillated cornstarch and glass microsphere suspensions.
  • To characterize the dynamic behavior and instabilities of these holes at varying accelerations.

Main Methods:

  • Observation of stable holes in a 0.5 cm deep aqueous suspension of cornstarch subjected to vertical oscillations.
  • Application of finite perturbations and varying accelerations (a > 10g) to induce hole formation.
  • Analysis of hole morphology, stability, and transition to instability (e.g., fingerlike protrusions, hole division, delocalization).

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Main Results:

  • Stable, circular holes (approx. 0.5 cm wide) form in cornstarch suspension above 10g acceleration, persisting over 10^6 cycles.
  • At approximately 17g, hole rims become unstable, leading to fingerlike protrusions or division.
  • Higher accelerations cause hole delocalization, erratic undulations, and surface coverage.

Conclusions:

  • Vertically oscillated suspensions can form persistent, stable holes under specific acceleration thresholds.
  • The observed phenomena, including instabilities and delocalization, are characteristic of non-Newtonian fluid behavior under dynamic forces.
  • Similar hole formation and instability patterns were observed in glass microsphere suspensions, suggesting a generalizable physical mechanism.