Abstract
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.
| Original language | Undefined |
|---|---|
| Pages (from-to) | 194-205 |
| Number of pages | 12 |
| Journal | Rheologica acta |
| Volume | 31 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1992 |
Keywords
- IR-85731
- nearly viscometric flow
- METIS-129225
- torsion pendulum
- complex shear modulus
- Superimposed oscillatory shear