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Related Experiment Video

Updated: Jun 14, 2026

Measuring the Mechanical Properties of Glass Fiber Reinforcement Polymer Composite Laminates Obtained by Different Fabrication Processes
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Mechanism to explore lamination rate.

Lionel Rossi1

  • 1Department of Aeronautics, Imperial College London, Prince Consort Road, London SW7 2AZ, UK. l.rossi@imperial.ac.uk; rossi_lionel@yahoo.fr

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

A new method quantifies fluid lamination and folding using Lagrangian acceleration. This discovery aids in designing efficient mixers, especially for low Reynolds number flows.

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Area of Science:

  • Fluid dynamics
  • Rheology
  • Experimental physics

Background:

  • Lamination and folding are critical phenomena in fluid dynamics, particularly in microfluidic devices and polymer processing.
  • Quantifying these processes is essential for optimizing mixing and material manipulation.

Purpose of the Study:

  • To identify and quantify a novel mechanism for lamination and folding in fluid flows.
  • To develop a method for predicting and measuring lamination and folding rates using physical and experimental approaches.

Main Methods:

  • Utilized an interlaced structure of velocity and Lagrangian acceleration to define a local angular Lagrangian velocity.
  • Quantified the rate of change of velocity direction (angular Lagrangian velocity) based on acceleration components perpendicular to velocity.
  • Employed three experimental flows driven by electromagnetic forces to validate the approach and extract folding rate intensities.

Main Results:

  • Demonstrated a direct correlation between spatial variations in angular Lagrangian velocity and the lamination/folding rate.
  • Achieved good agreement between predicted lamination rates and observed grid deformation in experimental flows.
  • Extracted folding rate intensities across different characteristic length scales.

Conclusions:

  • The identified mechanism provides a robust method for quantifying fluid lamination and folding.
  • This quantification offers new possibilities for the design of advanced mixers, particularly for low Reynolds number applications.
  • The approach bridges theoretical understanding with experimental validation for complex flow phenomena.