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

Henricus T.M. van den Ende, J. Mellema, C. Blom

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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 languageUndefined
Pages (from-to)194-205
Number of pages12
JournalRheologica acta
Issue number2
Publication statusPublished - 1992


  • IR-85731
  • nearly viscometric flow
  • METIS-129225
  • torsion pendulum
  • complex shear modulus
  • Superimposed oscillatory shear

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