NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
53rd NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
Session ID : 3C17
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OS18-1
Influence of Strain Amplitude on the Response of Concentrated Suspensions under Oscillatory Shear Flow
*Takatsune NarumiYasuhiro OkadaTomiichi Hasegawa
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Abstract
Concentrated suspensions of non-Brownian spheres dispersed in a Newtonian carrier liquid were placed under oscillatory shear flow. In large amplitude oscillation tests, it was found that the response waveforms consisted of a transient response after each reversal in the shearing direction, followed by viscous behavior. It was thought that rearrangements in the particulate microstructure could account for this transient response. Further, the characteristic strain for the microstructural rearrangement was found to be essentially independent of the oscillation frequency. In addition, the fluidity in the oscillatory flow after the transient response was found to be higher than that in the steady flow case. In small amplitude oscillation tests, a non-sinusoidal response was obtained due to the history in the rearrangement process.
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© 2004 Committee for Mechanics and Structure,Science Council
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