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Arrested segregative phase separation in capillary tubes.

R Hans Tromp1, Saskia Lindhoud

  • 1NIZO Food Research, Kernhemseweg 2, 6718 ZB Ede, The Netherlands. Hans.Tromp@nizo.nl

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 10, 2006
PubMed
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Phase separation in capillaries arrests into plugs when domain size equals tube diameter. This study describes plug formation in polymer solutions, finding plug size scales with capillary diameter to the power of 1.3.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Fluid Dynamics

Background:

  • Phase separation in confined geometries can arrest, forming distinct domain structures.
  • Understanding arrested states is crucial for controlling material properties and processes.

Purpose of the Study:

  • To describe the arrested plug state during phase separation of an aqueous polymer solution in a capillary tube.
  • To investigate the influence of capillary dimensions and density matching on plug formation and size.

Main Methods:

  • Studied phase separation in a capillary tube using an aqueous mixture of two incompatible polymers.
  • Utilized salt addition for density matching to control the Bond number (gravitational force relative to capillary force).
  • Analyzed plug formation pathways and scaled plug size with capillary diameter and length.

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Main Results:

  • Arrested plug state observed when domain size approaches capillary diameter.
  • Stable plugs form when capillary radius is below a critical value, independent of capillary length.
  • Average plug size scales with capillary diameter to the power of 1.3, exceeding theoretical predictions.
  • Plug size distribution is universal (polydispersity 1.1-1.2), with correlations suggesting an additional length scale.

Conclusions:

  • The formation pathway of plugs differs from standard fluid thread instabilities.
  • Plug size is primarily governed by capillary diameter, not capillary length, under density-matched conditions.
  • The observed scaling and size correlations indicate complex physics governing arrested phase separation in capillaries.