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Related Experiment Videos

Inline ultrasonic rheometry by pulsed Doppler.

David M Pfund1, Margaret S Greenwood, Judith A Bamberger

  • 1Pacific Northwest National Laboratory, Battelle Boulevard, MS K7-15, Richland, WA 99352, USA. david.pfund@pnl.gov <david.pfund@pnl.gov>

Ultrasonics
|July 1, 2006
PubMed
Summary
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This study introduces a non-invasive method to measure non-Newtonian fluid viscosity using pulsed ultrasonic Doppler velocimetry. This technique enables real-time monitoring of fluid properties in pipe flow, crucial for industrial process control.

Area of Science:

  • Fluid Mechanics
  • Rheology
  • Ultrasonic Measurement Techniques

Background:

  • Accurate viscosity measurement is critical for non-Newtonian fluids in industrial processes.
  • Traditional methods can be invasive or unsuitable for real-time monitoring.
  • Understanding fluid behavior in pipe flow requires detailed velocity profile data.

Purpose of the Study:

  • To present a non-invasive method for determining the viscosity of non-Newtonian fluids.
  • To validate the technique using laminar pipe flow and a shear-thinning gel.
  • To discuss the operational parameters and limitations of the Doppler-based instrument.

Main Methods:

  • Utilizing a pulsed ultrasonic Doppler velocimeter to measure the flow profile.
  • Determining the pressure drop along a straight pipe section.

Related Experiment Videos

  • Calculating viscosity based on flow profile and pressure drop data.

    • Main Results:

    • Successfully demonstrated non-invasive viscosity determination for a shear-thinning gel.
    • Presented rheograms illustrating the fluid's shear-thinning behavior.
    • Identified velocity gradient broadening as a key limitation near pipe walls.

    Conclusions:

    • The pulsed ultrasonic Doppler velocimeter offers a viable non-invasive approach for real-time viscosity measurements.
    • The method is suitable for monitoring and control applications in pipe flow.
    • Limitations, particularly for strongly shear-thinning fluids, require careful consideration of instrument parameters.