複雑流体の構造変化と流動性に関する研究

概要

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Fluidity changes of various complex fluids corresponding to those structure changes have been investigated. Peculiar responses of the fluids were mainly examined in transient flows. Electro-rheological characteristics of liquid crystals were systematically clarified and relatively simple models were developed for both steady and oscillatory flows. Flow induced unstable structure generated with a liquid crystalline polymer were examined in slit flows with a corner. The characteristics of the unstable texture were clarified and the stability of the structure was controlled with the channel design. Typical transient responses of concentrated suspensions due to structure rearrangements of particles have been clarified in re-started flows and LAOS flows. It was found in LAOS experiments that the response waveforms consisted of the transient response after each reversal in the shearing direction, followed by purely viscous behavior. The characteristic strain for the microstructural rearrangement was found to be essentially independent of the oscillation frequency, and showed good agreement with the corresponding characteristic strain obtained from the re-started flows.
2010-12-15