LAOS (Large Amplitude Oscillatory Shear) Analysis for Shear-Thickening Behavior of Concentrated Slurry

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  • 高濃度スラリーが示すShear Thickening挙動のLAOS解析
  • コウノウド スラリー ガ シメス Shear Thickening キョドウ ノ LAOS カイセキ

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<p>Rheological properties, especially shear thickening behaviors of high-concentrated slurries have been analyzed by using large amplitude oscillatory shear (LAOS) measurements. Concentrated slurries often exhibit shear thickening that is observed as viscosity increase with shear rate in addition to shear thinning as viscosity decrease with the shear rate. The LAOS measurement is useful for the analysis of these nonlinear rheological behaviors. In this study, we applied the LAOS measurement to two model slurries indicating continuous and discontinuous shear thickening behaviors and proposed new indices to quantitatively express the shear thickening/thinning and strain hardening/softening. These indices reflecting the phase and intensity of the third harmonic resulting from the Fourier transform of the time-dependent strain well described the continuous and discontinuous shear thickening.</p>

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