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Updated: Aug 11, 2026
09:37
Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole
Published on: August 26, 2019
Non-Invasive liquid viscosity characterization in Fluid-Filled pipes using zero group velocity guided wave resonances
Tianchen Sheng1, Hao Cong1, Zaixuan Zhu1
1Center of Ultra-precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin 150080, China; Key Lab of Ultra-precision Intelligent Instrumentation (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150080, China.
Ultrasonics
|August 4, 2026
Summary
This study introduces a non-invasive method for monitoring liquid viscosity in pipes using Zero Group Velocity (ZGV) resonances. The technique accurately measures viscosity by analyzing amplitude attenuation from external pipe-wall measurements.
Area of Science:
- Physics
- Materials Science
- Chemical Engineering
Background:
- Non-invasive liquid viscosity monitoring in sealed pipelines is crucial for industrial process control.
- Conventional methods often necessitate fluid sampling or sensor insertion, posing practical challenges.
Purpose of the Study:
- To develop and validate a non-invasive technique for characterizing liquid viscosity in elastic pipes using Zero Group Velocity (ZGV) guided-wave resonances.
- To leverage external pipe-wall measurements for viscosity determination, eliminating the need for internal access.
Main Methods:
- Derivation of a 6x6 characteristic equation for axisymmetric wave propagation in a fluid-filled hollow cylinder, incorporating viscous shear waves.
- Utilizing perturbation analysis to identify viscosity-dependent signatures: frequency shift and amplitude attenuation.
- Employing an electromagnetic acoustic transducer (EMAT) to excite L(0,4)-type ZGV resonance for experimental validation.
Main Results:
- Amplitude attenuation was identified as the most sensitive indicator of viscosity due to boundary-layer shear dissipation.
- Experimental validation with water-glycerol mixtures (8.9x10^-4 to 1.412 Pa·s) yielded a highly accurate empirical calibration curve (R^2 = 0.9951).
- The couplant-free EMAT configuration demonstrated consistent resonance tracking with minimal frequency variation (±0.2%) and achieved a repeatability-limited inversion precision of ±10%.
Conclusions:
- Zero Group Velocity (ZGV) guided-wave resonances offer a promising non-invasive approach for liquid viscosity characterization in pipelines.
- The amplitude attenuation signature provides a sensitive and reliable metric for viscosity measurement.
- The validated EMAT-based method enables accurate and repeatable viscosity monitoring without disrupting industrial processes.
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