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Wetting Dynamics in an Angular Channel.

Chen Zhao1,2, Tian Yu3, Jiajia Zhou4,5

  • 1Center of Soft Matter Physics and its Applications, Beihang University, Beijing 100191, China.

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|September 20, 2021
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Summary
This summary is machine-generated.

Liquid filling in channels follows the Lucas-Washburn law, but channel deformation significantly alters the filling speed. Even slight deformations can reduce the filling prefactor by 50%, explaining previous experimental discrepancies.

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Area of Science:

  • Fluid dynamics
  • Capillary phenomena
  • Materials science

Background:

  • Capillary-driven liquid filling is crucial in microfluidics and porous media.
  • The classical Lucas-Washburn law describes this process but often shows deviations in experiments.
  • Understanding factors influencing filling dynamics is essential for optimizing various applications.

Purpose of the Study:

  • To investigate the impact of channel deformation on capillary-driven liquid filling dynamics.
  • To analyze the coupling between bulk and finger-like liquid filling in a deformed channel.
  • To explain experimental discrepancies in liquid filling prefactors.

Main Methods:

  • Theoretical analysis of liquid filling in a thin, slightly inflated rectangular channel.
  • Modeling the interplay between the bulk and finger parts of the liquid front.
  • Calculating the time dependence of liquid amount (m) considering channel deformation.

Main Results:

  • Liquid amount (m) still follows the Lucas-Washburn law (m ∝ t^1/2).
  • The prefactor is highly sensitive to channel deformation.
  • A 0.1% strain can reduce the filling prefactor by 50%.

Conclusions:

  • Channel deformation significantly modifies capillary-driven liquid filling.
  • The proposed model explains observed deviations in liquid filling prefactors.
  • This finding has implications for designing and controlling fluid transport in microscale devices.