01.01.2003 | Original Contribution
Monodomain response of finite-aspect-ratio macromolecules in shear and related linear flows
Erschienen in: Rheologica Acta | Ausgabe 1-2/2003
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Abstract.
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The entire monodomain phase diagram of a finite-aspect-ratio nematic fluid in a linear flow field is equivalent to the phase diagram of an infinite-aspect-ratio fluid (thin rods or discs) in a related linear velocity field.
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Rod-like and discotic macromolecules with reciprocal aspect ratios have equivalent bulk shear response, related by a simple director transformation.
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Out-of-plane, shear-induced monodomains (steady and transient) either are symmetric about the shearing plane (e.g., logrolling and kayaking modes), or occur in pairs mirror-symmetric about the shearing plane (out-of-plane steady and periodic "tilted kayaking" modes), revealing a symmetry mechanism for bi-stability.
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A tensor analog of the Leslie alignment vs tumbling criterion, which is developed and applied to predict the multiplicity, stability, and steady or transient property of shear-induced monodomains.