Monitoring the Viscoelastic Behavior of Complex Fluids Using Multi-Frequency Resonance Tracking

Abstract eng:
This paper presents a resonance sensor that is able to monitor shear storage and shear loss modulus of a complex fluid. Using a frequency tracking control loop, the dynamic properties of a vibrating circular tube that is in contact with the fluid are evaluated. An analytical sensor model allows to relate the dynamic properties of the coupled system tube-fluid with the mechanical properties of the fluid itself. By simultaneously controlling multiple resonance modes of the oscillator, a discrete spectrum of the complex moduli can be monitored. As an example, a viscoelastic xanthan gum solution is characterized at five discrete frequencies between 2 kHz and 20 kHz. The measurements are combined with a conventional mechanical rheometer representing the lower frequency range from 10 to 300 Hz. The results are compared to measurements obtained by diffusing-wave spectroscopy (DWS).

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