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Optical Coherence Tomography Velocimetry for In-Line Processing: Velocity Profiles and the Intermittency of Opaque

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Summary

Optical coherence tomography (OCT) velocimetry was used to analyze complex fluids like lamellar surfactant gel networks and powdered milk. This technique revealed distinct flow behaviors and turbulence characteristics in real-world manufacturing conditions.

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Area of Science:

  • Fluid dynamics
  • Optical measurement techniques
  • Materials science

Background:

  • Complex fluids are ubiquitous in manufacturing, but their flow behavior is challenging to measure in-line.
  • Traditional velocimetry methods are often unsuitable for opaque or dynamic fluid systems.

Purpose of the Study:

  • To demonstrate optical coherence tomography (OCT) velocimetry for in-line processing of complex fluids.
  • To characterize the flow profiles and turbulence characteristics of lamellar surfactant gel networks (LGNs) and powdered milk.

Main Methods:

  • OCT velocimetry was performed on a test rig with approximately 40 L of opaque complex fluids (LGNs and powdered milk).
  • Velocity profiles and fluctuations were measured for small fluid volumes (3.4 pL).
  • OCT measurements were correlated with independent flow rate and viscosity data.

Main Results:

  • OCT velocimetry successfully measured velocity profiles characteristic of power law fluids in LGNs.
  • LGNs exhibited smooth, steady flows, while powdered milk showed marked instability.
  • Both fluids displayed intermittent behavior and Kolmogorov scaling, indicative of turbulence.

Conclusions:

  • OCT velocimetry is a viable technique for in-line analysis of complex fluid dynamics.
  • The study highlights differences in flow stability between LGNs and powdered milk.
  • OCT velocimetry can detect dynamic changes in fluid formulation and conditions, such as salt addition or biofouling.