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Tailoring porous media for controllable capillary flow.

Mingchao Liu1, Si Suo2, Jian Wu3

  • 1Department of Engineering Mechanics, CNMM & AML, Tsinghua University, Beijing 100084, China; School of Civil Engineering, The University of Sydney, Sydney, NSW 2006, Australia.

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Researchers can now precisely control capillary flow in porous media by adjusting the porous structure

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Microfluidics

Background:

  • Controlling capillary flow in porous media is crucial for various applications.
  • Tuning pore size or surface wettability for flow control presents significant challenges.

Purpose of the Study:

  • To propose a novel method for accurately controlling capillary flow.
  • To demonstrate the adjustment of liquid flow by capillary penetration through geometric tuning of porous media.

Main Methods:

  • Development of a general framework based on Darcy's law for capillary flow control.
  • Utilizing finite element method (FEM) for numerical simulations to validate theoretical predictions.

Main Results:

  • Design of a basic capillary component with a tunable velocity gradient.
  • Demonstration of flow accelerator and flow resistor elements.
  • Realization of multi-functional fluidic devices with controllable capillary flow through element assembly.
  • Validation of all designs via numerical simulations.
  • Extension of the concept to three-dimensional porous media design.

Conclusions:

  • Geometric tailoring of porous media offers precise control over capillary flow.
  • The proposed framework enables the creation of adaptable fluidic devices.
  • The concept is scalable to 3D porous structures.