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Apparent slip over a solid-liquid interface with a no-slip boundary condition.

Junfeng Zhang1, Daniel Y Kwok

  • 1Nanoscale Technology and Engineering Laboratory, Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 17, 2004
PubMed
Summary
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This study investigates solid-liquid slip using a lattice Boltzmann method. Stronger solid-fluid attraction can lead to negative slip length, linking slip to realistic interactions and contact angles.

Area of Science:

  • Fluid Dynamics
  • Interfacial Science
  • Computational Physics

Background:

  • Understanding solid-liquid slip is crucial for microfluidics and wetting phenomena.
  • Previous models often simplify solid-fluid interactions, limiting realistic predictions.
  • The lattice Boltzmann method (LBM) offers a kinetic approach to fluid dynamics.

Purpose of the Study:

  • To investigate solid-liquid slip phenomena using a mean-field free-energy lattice Boltzmann approach.
  • To establish a connection between realistic solid-fluid interactions, contact angles, and interfacial slip.
  • To explore the influence of solid-fluid attraction strength on slip length.

Main Methods:

  • Utilized a recently proposed mean-field free-energy lattice Boltzmann approach.

Related Experiment Videos

  • Applied a general bounce-back no-slip boundary condition at the solid-liquid interface.
  • Analyzed the kinetic behavior of the LBM at the interface.

    • Main Results:

    • Observed liquid slip at the interface due to specific solid-fluid interactions.
    • Demonstrated that interfacial slip is directly related to solid-fluid interaction strength and contact angle.
    • Showed that a stronger solid-fluid attraction can result in a negative slip length.

    Conclusions:

    • The lattice Boltzmann method effectively captures kinetic interfacial phenomena.
    • Realistic solid-fluid interactions are key determinants of solid-liquid slip and contact angles.
    • Negative slip lengths are achievable under specific attractive solid-fluid interaction conditions.