Torsion pendula with electromagnetic drive and detection system for measuring the complex shear modulus of liquids in the frequency range 80?2500 Hz

Blom, C.; Mellema, J.

doi:10.1007/bf01333881

Cited by 39 publications

(22 citation statements)

References 8 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dynamic viscosities were determined with four single torsion pendulums operating in the frequency range 80 Hz to 2500 Hz [19] and with a nickel tube torsion resonator in the frequency range 4kHz to 170 kHz [20]. The measuring principle is based on the determination of the resonance frequencies and bandwidths of the resonator immersed in air and subsequently in the liquid under investigation.…”

Section: Rheological Methodsmentioning

confidence: 99%

Hard sphere colloidal dispersions: Mechanical relaxation pertaining to thermodynamic forces

et al. 1987

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Rheological Methodsmentioning

confidence: 99%

Hard sphere colloidal dispersions: Mechanical relaxation pertaining to thermodynamic forces

et al. 1987

Self Cite

View full text Add to dashboard Cite

show abstract

“…The choice of instruments in the intermediate range is limited (Benzing and Russel 1981;Sittel et al 1954;Konno et al 1968). Although the frequency range of some instruments is close to the required range for this application, the range of applicable viscosities is often too low (Blom and Mellema 1984;Crassous et al 2005). …”

Section: Linear Viscoelastic Fluidmentioning

confidence: 99%

Linear viscoelastic fluid characterization of ultra-high-viscosity fluids for high-frequency damper design

2015

View full text Add to dashboard Cite

This paper presents the use of a state of the art damper for high-precision motion stages as a sliding plate rheometer for measuring linear viscoelastic properties in the frequency range of 10 Hz-10 kHz. This device is relatively cheap and enables to obtain linear viscoelastic (LVE) fluid models for practical use in precision mechanics applications. This is an example of reversed engineering, i.e., turning a machine part into a material characterization device. Results are shown for a high-viscosity fluid. The first part of this paper describes the damper design that is based on a high-viscosity fluid. This design is flexure-based to minimize parasitic nonlinear forces such as hysteresis and stick-slip. In the second part of the paper, LVE fluid characterization by means of the damper setup is presented. Measurements are performed and model parameters are fitted by a non-convex optimization algorithm in order to obtain the frequency-dependent behavior of the fluid. The resulting fluid model is validated by comparison with a second measurement with a different damper geometry. This paper shows that LVE fluid characterization between 10 Hz and 10 kHz for elastic high-viscosity fluids is possible with a motion stage damper for which the undamped behavior is known.

show abstract

“…The instrument discussed is an extension of the torsion pendula developed in our laboratory some years ago by Blom and Mellema [2]. At that time, much attention had been paid to the mechanical and thermal stability of the pendula and the excitation and detection system.…”

Section: Description Of the Instrument And The Measuring Proceduresmentioning

confidence: 99%

“…Only the distances to the lump are slightly different, so one has to adjust the values for Cz as measured by Blom and Mellema [2]: C2 = 6.6.10 -3 Vs/rad 2 for resonators 1 and 2, C2 = 1.6.10 -3 Vs/rad 2 for resonators 3 and 4. These corrected values are, within 5 %, equal to values obtained from a calculation of the magnetic flux through the detection coils.…”

Section: Z~=(q~) (L+2e-2ig*h) •mentioning

confidence: 99%

Driven torsion pendulum for measuring the complex shear modulus in a steady shear flow

1992

Self Cite

View full text Add to dashboard Cite

To investigate the viscoelastic behavior of fluid dispersions under steady shear flow conditions, an apparatus for parallel superimposed oscillations has been constructed which consists of a rotating cup containing the liquid under investigation in which a torsional pendulum is immersed. By measuring the resonance frequency and bandwidth of the resonator in both liquid and in air, the frequency and steady-shear-rate-dependent complex shear modulus can be obtained. By exchange of the resonator lumps it is possible to use the instrument at four different frequencies: 85, 284, 740, and 2440 Hz while the steady shear rate can be varied from 1 to 55 s -1. After treatment of the theoretical background, design, and measuring procedure, the calibration with a number of Newtonian liquids is described and the accuracy of the instrument is discussed.

show abstract

Torsion pendula with electromagnetic drive and detection system for measuring the complex shear modulus of liquids in the frequency range 80?2500 Hz

Cited by 39 publications

References 8 publications

Hard sphere colloidal dispersions: Mechanical relaxation pertaining to thermodynamic forces

Hard sphere colloidal dispersions: Mechanical relaxation pertaining to thermodynamic forces

Linear viscoelastic fluid characterization of ultra-high-viscosity fluids for high-frequency damper design

Driven torsion pendulum for measuring the complex shear modulus in a steady shear flow

Contact Info

Product

Resources

About