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Diffusive intertwining of two fluid phases in chemically patterned microchannels.

Olga Kuksenok1, David Jasnow, Anna C Balazs

  • 1Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 20, 2003
PubMed
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A simulation of binary fluid flow in microchannels reveals that patterned surfaces create frustrated advection. This leads to a nonlinear, temporally periodic state where fluids become intertwined due to positive feedback.

Area of Science:

  • Fluid dynamics
  • Soft matter physics
  • Microfluidics

Background:

  • Understanding fluid behavior in microchannels is crucial for applications like drug delivery and diagnostics.
  • Chemically patterned surfaces can influence fluid behavior but predicting complex interactions remains challenging.

Purpose of the Study:

  • To investigate the flow dynamics of a binary fluid in a microchannel with patterned surfaces.
  • To explore the nonlinear phenomena arising from frustrated advection and fluid-substrate interactions.

Main Methods:

  • Coarse-grained modeling was employed to simulate a pressure-driven binary fluid (A and B).
  • A three-dimensional microchannel with distinct A- and B-like patches on top and bottom surfaces was used.
  • Analysis focused on the interplay between imposed flow (advection) and fluid-surface interactions.

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Main Results:

  • Frustrated advection occurred due to the placement of A-like patches in the B fluid stream and vice versa.
  • A competition between advection and surface interactions introduced system nonlinearity.
  • This nonlinearity resulted in a temporally periodic state with intertwined A and B fluids.

Conclusions:

  • Chemically patterned substrates can induce complex, nonlinear fluid behavior.
  • Positive feedback from patterned surfaces destabilizes the fluid interface, leading to intertwined flow.
  • The study demonstrates a mechanism for controlling microfluidic mixing and patterning.