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Optimization and evaluation of radially interconnected versus bifurcating flow distributors using computational fluid

E Davydova1, S Deridder2, S Eeltink2

  • 1Analytical Chemistry Group, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, PO Box 94157, 1090 GD Amsterdam, The Netherlands.

Journal of Chromatography. A
|January 17, 2015
PubMed
Summary

Bifurcating distributors (BF) offer superior performance for achieving uniform flow fields and minimal band variance in microfluidic devices. Optimal design involves specific angles between branches, with performance linked to distributor volume.

Keywords:
Chip-based separationsComputational fluid dynamicsFlow distributorsMicrofluidicsRobust performance

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Area of Science:

  • Microfluidics
  • Computational Fluid Dynamics (CFD)
  • Chemical Engineering

Background:

  • Accurate flow distribution is critical for microfluidic device performance, impacting band variance and velocity uniformity.
  • Previous designs often face challenges with achieving optimal flow characteristics, especially at the microscale.
  • Micro-milling fabrication techniques necessitate channel widths of at least 100 μm.

Purpose of the Study:

  • To evaluate and compare the performance of different flow distributor designs, including bifurcating (BF) and radially interconnected (RI) types.
  • To identify key design parameters influencing flow uniformity and band variance.
  • To determine the optimal flow distributor configuration for microfluidic applications.

Main Methods:

  • Computational Fluid Dynamics (CFD) simulations were employed to analyze fluid flow patterns.
  • Performance was assessed based on velocity field uniformity and band variance.
  • Designs were evaluated considering a minimum channel width of 100 μm for micro-milling fabrication.

Main Results:

  • Flow distributor volume was identified as the primary factor correlating with performance.
  • Bifurcating distributors (BF) demonstrated the best performance regarding band variance.
  • Optimal BF distributor performance was achieved with an angle of 175° between bifurcation branches, yielding a band variance of approximately 0.01 mm².

Conclusions:

  • BF distributors are recommended for microfluidic applications requiring minimal band variance.
  • The separation bed should be placed immediately downstream of the flow distributor.
  • While BF and RI distributors tolerate some imperfections, severe channel blockages can significantly degrade performance.