S
Siegfried Hess
Researcher at Technical University of Berlin
Publications - 170
Citations - 4976
Siegfried Hess is an academic researcher from Technical University of Berlin. The author has contributed to research in topics: Liquid crystal & Shear flow. The author has an hindex of 38, co-authored 170 publications receiving 4801 citations. Previous affiliations of Siegfried Hess include ETH Zurich & University of Erlangen-Nuremberg.
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Journal ArticleDOI
Rheological and small angle neutron scattering investigation of shear‐induced particle structures of concentrated polymer dispersions submitted to plane Poiseuille and Couette flowa)
H. M. Laun,R. Bung,Siegfried Hess,W. Loose,Op. Hess,K. Hahn,E. Hädicke,R. Hingmann,F. Schmidt,P. Lindner +9 more
TL;DR: In this article, small angle neutron scattering (SANS) was used to investigate the particle structures of concentrated polymer dispersions in a wide range of shear rates, and the results showed that drastic viscosity transitions may occur, whereas the structural changes detectable by SANS may remain weak.
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Fokker-Planck-Equation Approach to Flow Alignment in Liquid Crystals
TL;DR: In this article, a nonlinear inhomogeneous relaxation equation for the alignment tensor is derived from a Fokker-Planck-equation for the orientational distribution function where torques exerted by a molecular field and by the gradient of the flow velocity are taken into account.
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Rheological Evidence for a Dynamical Crossover in Polymer Melts via Nonequilibrium Molecular Dynamics
Martin Kröger,Siegfried Hess +1 more
TL;DR: Findings confirm a newly proposed relationship between dimensionless critical weight, characteristic length, and flexibility and suggest that the entanglement molecular weight N(e) for the flexible FENE chain model could be comparable in size or even larger than its critical molecularWeight N(c).
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Rheology and structural changes of polymer melts via nonequilibrium molecular dynamics
TL;DR: In this article, nonequilibrium molecular dynamics computer simulations of a planar Couette flow are presented for the multibead anharmonic-spring model, where the finitely extensible nonlinear elastic force law is used to connect the up to 100 beads of a chain molecule.
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Alignment tensor versus director: Description of defects in nematic liquid crystals.
TL;DR: The core structure of nematic defects cannot be represented by the usual director field, but requires the description by the full orial calculus.