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On the behaviour of the elongational viscosity of a nematic polymer in elongational flow
Author(s) -
Diogo A. C.
Publication year - 1988
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19880200136
Subject(s) - liquid crystal , perpendicular , flow (mathematics) , viscosity , materials science , orientation (vector space) , field (mathematics) , mechanics , planar , physics , optics , composite material , geometry , mathematics , computer graphics (images) , computer science , pure mathematics
For nematic materials, the elongational viscosity depends on the orientation of the director field relative to the velocity field. A computation of the elongational viscosity for various flow geometries is presented. It is shown that for uniaxial elongational flow the director aligns along the flow direction with a characteristic time τ E = −2γ 1 /(3γ 2 ϵ); for planar elongational flow, the director aligns perpendicular to the flow with a characteristic time τ E2 = ‐γ 1 /(γ 2 ϵ).