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Attaining Tailored Wicking Behavior with Additive Manufacturing.

Evan Noce1, Irfan Zobayed1, Richard J Fontenot1

  • 1Department of Mechanical Engineering, Rice University, Houston, Texas 77005, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 17, 2024
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Summary
This summary is machine-generated.

Additive manufacturing enables custom wicking materials with tailored fluid propagation. This new method allows for non-conventional wicking behaviors beyond standard models, optimizing performance for specific applications.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Engineering

Background:

  • Additive manufacturing (AM) offers a versatile platform for creating customized porous materials.
  • Traditional wicking in porous media is often limited by Washburnian behavior, restricting optimization for diverse applications.
  • Developing materials with predictable and controllable fluid propagation is crucial for fields like thermal management and microfluidics.

Purpose of the Study:

  • To present a novel method for tailoring wicking behavior in porous materials using AM.
  • To achieve arbitrary target functions for fluid propagation distance over time.
  • To overcome the limitations of conventional Washburnian wicking.

Main Methods:

  • Utilizing AM to fabricate nonuniform porous materials with a gridded structure of rotated layers and spatially varying unit cell sizes.
  • Developing analytical models for capillary pressure and solid fraction, and a semianalytical model for permeability.
  • Employing an inverse design algorithm, conceptualizing nonuniform materials as fluidic resistors, to generate spatially varying parameters for targeted wicking performance.
  • Validating models with capillary rise experiments on uniform porous materials.

Main Results:

  • Successfully demonstrated the ability to tailor wicking behavior to specific target functions.
  • Created porous materials exhibiting non-conventional fluid propagation, including linear and piecewise linear relationships with time.
  • Validated analytical and semianalytical models for capillary pressure, solid fraction, and permeability.

Conclusions:

  • Additive manufacturing provides a powerful tool for designing advanced wicking materials with controllable fluid transport.
  • The developed inverse design method enables the creation of materials with bespoke wicking characteristics.
  • This approach opens new possibilities for optimizing fluid dynamics in microfluidic and thermal management systems.