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Clogging sensitivity of flow distributors designed for radially elongated hexagonal pillar array columns: a

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Flow distributors in micromachined pillar array columns are crucial for separation efficiency. This study used computational fluid dynamics to evaluate distributor designs under clogging conditions, finding MMI offers the highest stability.

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Area of Science:

  • Microfluidics and Separation Science
  • Computational Fluid Dynamics (CFD) modeling
  • Chemical Engineering and Materials Science

Background:

  • Flow distributors are critical for uniform flow distribution in micromachined pillar array columns (PACs), directly impacting separation efficiency.
  • Clogging from manufacturing artifacts, contaminated solvents, or complex samples can degrade performance by affecting flow distribution.
  • Achieving even fluid distribution and minimizing clogging sensitivity are essential for satisfactory separation performance.

Purpose of the Study:

  • To computationally investigate the effect of design parameters on flow distributor performance in PACs under various clogging conditions.
  • To evaluate known and novel flow distributor designs for their ability to equally spread flow along separation channels.
  • To identify flow distributor designs with enhanced stability and reduced sensitivity to clogging.

Main Methods:

  • A computational fluid dynamics (CFD) model was employed to simulate flow distribution in PACs with different flow distributor designs.
  • Evaluated designs included bifurcating (BF), radially interconnected (RI), mixed-mode (MMI, MMII, MMIII), with varying channel width, distributor width, pillar aspect ratio, and contact zone rows.
  • Performance metrics included mean elution time, volumetric variance, asymmetry factors, and pressure drop.

Main Results:

  • Channel width and pillar aspect ratio significantly influence flow distribution only under clogged conditions, not in non-clogged distributors (except for pressure drop).
  • Increasing distributor width and contact zone rows after the initial split did not improve clogging alleviation.
  • The MMI distributor, with specific dimensions (3 µm channel width, 20 aspect ratio, 8 exits, 3 contact zones), demonstrated superior stability and minimal clogging sensitivity.

Conclusions:

  • Flow distributor design is critical for maintaining separation efficiency, particularly under potential clogging scenarios.
  • The mixed-mode (MMI) design shows significant promise for robust performance in microfluidic separation systems.
  • CFD modeling provides an effective approach to optimize flow distributor designs and predict performance under challenging conditions.