Modeling and experimental study of a flexural vibration sensor for density measurements

Wattinger, T.

doi:10.3929/ethz-a-010255269

Cited by 1 publication

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“…Since most parameters that are measurable with the classical torsional oscillator are presented in this work, the extension towards additional parameters is also part of future research. Wattinger (2014) has shown that flexural vibrations are preferable in order to measure the fluid density. Hence, the simultaneous use of both flexural and torsional vibrations would greatly improve the versatility of resonance fluid sensors, which yet require an external density measurement.…”

Section: Discussionmentioning

confidence: 99%

Simultaneous and continuous measurement of shear elasticity and viscosity of liquids at multiple discrete frequencies

2018

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This paper presents the extension of the classical torsional resonance viscometer towards the characterization of linear viscoelastic fluids. By simultaneously tracking multiple resonance frequencies, shear viscosity and elasticity can be monitored at multiple discrete frequencies at the same time. The proposed method is applied to the well-established sensor design of a simple rod-like structure, hence enabling a robust and versatile measurement system that can be used in different applications, such as in-line measurement or hand-held devices. In order to simultaneously control different resonance frequencies, multiple independent phase-locked loops are used, of which each subsystem is responsible for one natural vibration. An analytical description of the relationship between measurement parameters and physical fluid parameters is presented that is valid both for Newtonian and linear viscoelastic fluids. Consequently, calibration of the sensor is possible using Newtonian fluids only. To demonstrate the sensor, viscoelastic polymer and surfactant solutions are investigated at five frequencies between 2 kHz and 20 kHz. Additionally, the test fluids are characterized by means of a classical rotational rheometer (low frequency range) and diffusing-wave spectroscopy (high frequency range). The comparison of all methods shows very good agreement and validates the application of the sensor as resonant rheometer for viscoelastic fluids.

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Section: Discussionmentioning

confidence: 99%