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A new constitutive equation derived from network theory

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TLDR
In this paper, a constitutive equation is derived from a Lodge-Yamamoto type of network theory for polymeric fluids, where the network junctions are not assumed to move strictly as points of the continuum but allowed a certain "effective slip".
Abstract
A constitutive equation is derived from a Lodge—Yamamoto type of network theory for polymeric fluids. The network junctions are not assumed to move strictly as points of the continuum but allowed a certain “effective slip”. The rates of creation and destruction of junctions are assumed to depend on the instantaneous elastic energy of the network, or equivalently, the average extension of the network strand, in a simple manner. Agreement between model predictions and the I.U.P.A.C. data on L.D.P.E. is good.

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Citations
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A comparison study on high-order bounded schemes: Flow of PTT-linear fluid in a lid-driven square cavity

TL;DR: In this article, the convergence, stability and order of accuracy of several different numerical schemes are assessed and compared using a normalized variable diagram, and it is found that the higher-order and bounded schemes considered in the present study, only the CLAM, COPLA, CUBISTA, NOTABLE, SMART and WACEB schemes provide a steady converged solution to the prescribed tolerance of 1×10−5 at all studied Weissenberg (We) numbers, using a very fine mesh structure.

Drag and thrust effects of Viscoelastic fluids

Gaurav Goyal
TL;DR: In this article, the effect of swimming gait on bio-locomotion and characterizing the drag reducing fluids used for gravel-packing operations in the petroleum industry was studied. But the authors focused on the swimming of simplified two-dimensional bodies at low Reynolds numbers in complex fluids using the reciprocal theorem.

Flow-induced crystallization of polymers : modeling morphology and kinetics

TL;DR: Roozemond et al. as discussed by the authors investigated the rheology of solidifying high-density polyethylene (HDPE) with a RheoDSC device.
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Simulation of viscoelastic fluid flows in expansion geometry using finite volume approach

TL;DR: In this article, the simulation results on viscoelastic fluid flows in sudden expansion geometry with different expansion ratios are presented, including velocity profiles, shear stresses and first normal stress differences in some horizontal and vertical sections.
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Crystallization of Polypropylene Near the Surface in Injection-Molded Plaques: A Comparison of Morphology and a Numerical Analysis

TL;DR: In this article, skin morphology formation on injection-molded isotactic polypropylene (PP) was investigated using micro-beam synchrotron wide-angle X-ray diffraction and numerical simulation.
References
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Journal ArticleDOI

Conservation Laws for Liquid Crystals

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The Visco-elastic Properties of Network Structure I. General Formalism

TL;DR: In this article, the authors derived the stress-strain-time (S − S − T )relation at each instance of macroscopic observations by using the statistical mechanical considerations of equilibrium states.
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Constitutive equations from molecular network theories for polymer solutions

TL;DR: In this article, constitutive equations based on the network models of Yamamoto, Lodge, and Kaye are re-derived in a common notation involving the use of base vectors embedded in the deforming macroscopic continuum.
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Anisotropic Fluid Theory: A Different Approach to the Dumbbell Theory of Dilute Polymer Solutions

TL;DR: In this paper, the authors used the continuum theory of anisotropic fluids, as developed by Ericksen and others, to formulate an expression for the time derivative of the end-to-end vector of a linear macromolecule when used in conjunction with the equation describing the distribution function for a dilute solution of dumbbell elements.