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Simultaneous Measurements of Temperature and Viscosity for Viscous Fluids Using an Ultrasonic Waveguide.

Jinrui Huang1, Frederic Cegla1, Andy Wickenden2

  • 1NDE Group, Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK.

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Summary
This summary is machine-generated.

This study introduces a refined ultrasonic dipstick method to measure viscous fluid properties. The technique accurately determines fluid temperature and viscosity simultaneously, with high precision and repeatability.

Keywords:
temperatureultrasonic waveguideviscosityviscous fluids

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Acoustics

Background:

  • Accurate characterization of viscous fluids is crucial for numerous industrial applications.
  • Existing methods for measuring fluid properties like viscosity and temperature can be limited in precision or scope.
  • Ultrasonic techniques offer a non-invasive approach for material property assessment.

Purpose of the Study:

  • To develop and validate a refined ultrasonic dipstick method for simultaneous measurement of viscous fluid temperature and viscosity.
  • To address the challenge of interdependency between wave velocity and fluid properties in high-precision measurements.
  • To improve the accuracy and repeatability of fluid property characterization using ultrasonic shear waves.

Main Methods:

  • Utilized a waveguide immersed in viscous and reference liquids to measure ultrasonic properties.
  • Analyzed changes in elastic shear wave velocity and attenuation to determine fluid parameters.
  • Developed a model to account for the 'viscous effect' on wave propagation velocity.
  • Implemented a correction algorithm for velocity measurements.

Main Results:

  • Simultaneous determination of temperature and viscosity achieved with high precision.
  • The proposed method demonstrated excellent agreement with standard viscometers and resistance temperature detectors (RTDs).
  • Measurement repeatability was better than 2.0% for viscosity and 0.5% for temperature across a specified range.

Conclusions:

  • The refined ultrasonic dipstick method provides accurate and repeatable measurements of viscous fluid properties.
  • The developed viscous effect correction algorithm enhances measurement accuracy.
  • This technique offers a valuable tool for real-time monitoring and characterization of viscous fluids.