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Showing 1 to 11 of 11 for “"FENE"”.
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Studies of the Interaction Between Drag-Reducing Polymers and a Turbulent Flow Field Using Pulsed Image Velocimetry and FENE Bead-Spring Model
An understanding of polymer drag-reduction, discovered by Toms (1948), has remained a challenge to researchers in turbulence and polymer fluid mechanics. The intriguing aspect of this phenomenon is that the addition of high molecular weight, long chain polymer molecules in amounts as small as 1 ppm …
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Brownian dynamics simulations of fine-scale molecular models
… coarse-grained model, such as the Hookean or the FENE dumbbell models, which can be used in complex flow analysis, but have too few degrees of freedom to adequately describe the rheology. The Adaptive Length Scale (ALS) model proposed by Ghosh et al. is only marginally more complicated than the …
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Effects of the Non-Newtonian Rheology on the Fluid-Structure Interactions in Biological Flows
… in Newtonian and viscoelastic (Giesekus and FENE-CR) uniform flows are investigated. It is found that the Reynolds number promotes the flapping motion of the filament. The viscoelasticity of the Giesekus fluid facilitates the flapping motion of the filament. In contrast, the viscoelasticity …
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Rheological characterization of polymers via dissipative particle dynamics
… rheology of a solution of DPD dumbbells using a FENE spring force law is studied in the first part of this thesis via simulation of steady shear flow and steady planar elongational flow. The rheological results are compared to dilute Brownian dynamics simulations of the same FENE dumbbell model. …
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Co-design of surface textures and non-newtonian fluids for decreased friction
… the rheological material functions using the FENE-P model, which connects the fluid behavior to the polymer-solvent pair, polymer concentration, and polymer finite extensibility. We obtain the FENE-P model parameters from either fitting or molecular properties, and show that either method …
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An experimental and theoretical investigation of the rheological properties and degradation of mucin solutions : (or why saliva becomes watery when removed from your mouth)
… with time. The first model considered is the FENEP model of a fluid, which is particularly suitable for describing the rheology of dilute polymer solutions (Newtonian solvents containing small amounts of dissolved polymer) as a result of its ability to capture nonlinear effects arising from …
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Effects of polymer concentration and molecular weight on the dynamics of visco-elasto-capillary breakup
… and of the radius using a single mode FENE-P model based on the one-dimensional analysis of Entov and Hinch for transient extensional flows are compared to the experimental observations of the radius of the liquid filament. Below a critical dilution, the stress in the necking thread is …
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Shear flow instabilities in viscoelastic fluids
… the analysis. Consequently we use the FENE–CR equations.
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Simulation of blood flows in a stenosed and bifurcating artery using finite volume methods and OpenFOAM
… Finitely Extensible Non-Linear Elastic (FENE), Phan-Thein-Tanner (PTT) models etc. Our Numerical approach is based on the finite volume methods implemented on the OpenFOAM platform. We employ the Giesekus, Oldroyd-B, and Generalized Oldroyd-B viscoelastic constitutive models in this …
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Numerical studies of Newtonian and viscoelastic fluids
… by the finitely extensible nonlinear elastic (FENE) dumbbell and Oldroyd-B models. The finite element method (FEM) is used to discretize the flow domain. The DNS results show that the permeability of a periodic porous medium depends on the wavelength used for arranging particles in the …
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Exponential Stability for a Diffusion Equation in Polymer Kinetic Theory
In this paper we present an exponential stability result for a diffusion equation arising from dumbbell models for polymer flow. Using the methods of semigroup theory, we show that the semigroup U(t) associated with the diffusion equation is well defined and that all solutions converge …