We investigated the relationship between concentration of nanosized fibers and rheological rheo-optic behaviors CNF suspensions containing unfibrillated prepared by a wet refinement system (Water Jet System). The behaved as gel in which entropic elasticity was dominant, entanglement among would be enhanced with fiber volume fraction. aggregates elongated flow direction deformed into elliptical ...

This study assesses the incorporation of nanocellulose in a paperboard feedstock emulating two scenarios industrial processes. It included production 170 g/m2 paperboard, using mixtures short-fiber and long-fiber fractions from recycled pulps with typical mill additives. In all cases, 3 wt. % was added to pulp suspensions. The first scenario involved three types addition mixture 78 long-fiber/2...

This paper deals with the problem of positivity preservation in numerical algorithms for simulating fiber suspension flows. In contrast to fiber orientation models based on the Advani-Tucker evolution equations for even-order orientation tensors, the probability distribution function of fiber orientation is approximated using the Galerkin discretization of the Fokker-Planck equation with Fourie...

We present an approach for numerically simulating the dynamics of flexible fibers in a threedimensional shear flow using a scalable immersed boundary (IB) algorithm based on Guermond and Minev’s pseudocompressible fluid solver. The fibers are treated as one-dimensional Kirchhoff rods that resist stretching, bending, and twisting, within the generalized IB framework. We perform a careful numeric...

A. Temperature Chambers 1735 B. Pressure Cells 1735 C. Stretching Equipment 1736 D. Fiber Spinning Equipment 1737 E. Fiber Drawing Apparatus 1738 F. Shear Apparatus 1739 IV. Combined Techniques 1739 A. Simultaneous SAXS/WAXD 1739 B. Raman Spectroscopy 1740 C. Laser Light Scattering 1741 D. Fourier Transform IR Spectroscopy 1743 V. Applications 1743 A. Materials-Based Studies 1743 1. Block Copol...

We introduce a novel light-scattering technique for investigating the dynamics of random media with a broad range of optical densities. By use of the spatial coherence properties of a single-mode optical fiber and the temporal coherence of a broadband source, the measurement volume is isolated at the end of the optical waveguide. Optical mixing between the fluctuating scattered light and the Fr...