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Related Concept Videos

Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.

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Related Experiment Video

Updated: May 8, 2026

Microfluidic Mixers for Studying Protein Folding
12:42

Microfluidic Mixers for Studying Protein Folding

Published on: April 10, 2012

A Planar Microfluidic Mixer Based on Logarithmic Spirals.

Thomas Scherr1, Christian Quitadamo, Preston Tesvich

  • 1Cain Department of Chemical Engineering Louisiana State University 110 South Stadium Drive Baton Rouge, LA 70803, USA.

Journal of Micromechanics and Microengineering : Structures, Devices, and Systems
|August 20, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel logarithmic spiral micromixer for efficient fluid mixing. The passive, planar device achieves high mixing efficiency across various flow rates, outperforming other designs without complex fabrication.

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Published on: November 13, 2014

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Last Updated: May 8, 2026

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13:59

Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology

Published on: November 13, 2014

Area of Science:

  • Microfluidics
  • Fluid Dynamics
  • Biomedical Engineering

Background:

  • Effective mixing is crucial in microfluidic devices for applications like diagnostics and drug delivery.
  • Existing planar micromixers often face limitations in efficiency or fabrication complexity.

Purpose of the Study:

  • To present a passive, planar micromixer design utilizing logarithmic spirals.
  • To evaluate its mixing performance and compare it with existing microfluidic mixer geometries.

Main Methods:

  • Fabrication using polydimethylsiloxane (PDMS) soft photolithography.
  • Characterization through numerical simulations and fluorescent microscopy.
  • Comparison with Archimedes spiral and Meandering-S mixer designs.

Main Results:

  • The logarithmic spiral micromixer demonstrated improved mixing efficiency over a broad range of Reynolds numbers.
  • Maximum mixing efficiency reached 86% at Re = 67, with a minimum of 53% at Re = 15.
  • 3-D simulations revealed Dean vortices and multilayered fluid folding, validated by confocal microscopy.

Conclusions:

  • The logarithmic spiral design enhances mixing through variable cross-sectional area and induced Dean vortices.
  • This micromixer offers superior performance compared to other planar designs without external fields or complex features.
  • Its simple, single-step lithography fabrication allows easy integration into micro-total analysis systems (µTAS).