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Showing 1 to 8 of 8 for “"Planar contraction"”.
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Stress- and velocity-field evolution in viscoelastic planar contraction flow dc by Lars Herbert Genieser.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1997.
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A Spectral Element Method for Viscoelastic Fluid Flow
… are discussed. The numerical simulations for a planar channel and a planar 2 : 1 contraction channel flows show the high accuracy of the current scheme and excellent agreement with other numerical studies. In order to improve the continuity of the spectral element approximation in the element …
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Dynamics of Rigid Fibers in a Planar Converging Channel
… of stiff fibers at high Reynolds number in a planar contraction is investigated. High speed imaging and LDV techniques are used to quantify fiber orientation distribution and turbulent characteristics. A nearly homogenous, isotropic grid generated turbulent flow is introduced at the …
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Contraction/expansion flow of dilute elastic solutions in microchannels
… values which have been observed in macroscale contraction flows. Subsequently, large Deborah numbers (equivalent to those observed on the macro scale in high viscosity solutions) are generated for low viscosity solutions without the interplay of significant inertial effects. High quality …
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Computational analysis of viscoelastic free surface flows
… flow. This algorithm is validated using the 4:1 planar contraction and results are reported. The developed viscoelastic algorithm has also been coupled with two interface tracking techniques one of which includes surface tension effects. These techniques are the Scalar Equation Algorithm (SEA) …
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Flow Behavior of Sparsely Branched Metallocene-Catalyzed Polyethylenes
… predict the flow through an abrupt 4:1 contraction geometry. The effects that sparse long-chain branching (M<sub>branch</sub> > M<sub>c</sub>) has on the shear and extensional rheological properties are analyzed in two separate treatments. The first focuses on the shear rheological …
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The planar entry flow behavior of polymer melts: an experimental and numerical analysis
The planar entry flow behavior of polystyrene, LDPE, and HDPE has been observed experimentally. The purpose of the work was to determine the cause of vortex growth and explain why this phenomenon occurs in some polymers but not in others. To accomplish this a die was constructed in which nearly any …
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Development of an efficient finite volume computational platform for the simulation of complex flows of complex fluids governed by the Rolie-Poly model
… test cases of the lid-driven cavity flow and the planar 4:1 contraction flow were used to validate the solver which was used with the OpenFOAM CFD package. Discrete Elastic Viscous Stress Splitting (DEVSS) technique and the Log-conformation Reformulation (LCR) methodology of Fattal and Kupferman …