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Showing 1 to 13 of 13 for “"viscoelastic flow"”.
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Experimental characterization of viscoelastic flow instabilities
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1996.
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Calculations of viscoelastic flow in a journal bearing
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1986.
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The solution of large viscoelastic flow problems using parallel iterative techniques
Efficient parallel computation of complex viscoelastic flows is essential to bring modem computer power to bear on fluid calculations where complicated constitutive descriptions are required. We have developed an efficient, parallel time integration scheme for calculating viscoelastic flows. The …
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A NUMERICAL STUDY OF NONLINEAR VISCOELASTIC FLOW AND NONISOTHERMAL POWER-LAW FLOW
Using the finite difference technique, the steady flow of a viscoelastic fluid through a contraction/expansion and a modified Graetz heat transfer problem for power-law fluids between parallel plates are numerically studied. The constitutive model used for the viscoelastic fluid flow extends the …
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Viscoelastic flow of polymer solutions around arrays of cylinders : comparison of experiment and theory
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1997.
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Finite element simulation of viscoelastic flow: effect of the rheological model and the mesh
The numerical simulation of viscoelastic flows was studied in this work. In particular the effect of mesh refinement on the quality and the convergence of the finite element method was examined, as well as the differences that may be found by using several rheological models to describe the …
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Computational analysis of viscoelastic free surface flows
… requirements. Many of these polymers are viscoelastic fluids. The reduction in the sizes of components make physical experimentation difficult and costly. Therefore computational tools are being sought to replace old methods of testing. This research has been concerned with the development …
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Elongational Flows in Polymer Processing
… the equations of melt-spinning in viscous and viscoelastic flow. These quasilinear hyperbolic equations model the uniaxial extension of a fluid thread before its solidification. We will address the following topics: first we shall prove existence, uniqueness, and regularity of solutions. Our …
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Computational modeling of fiber reinforced composites melt flow in nozzle extrudate for polymer deposition additive manufacturing.
… finite element method is applied to solve the flow kinematics and free surface shape of the nozzle-extrudate polymer melt that is defined by generalized Newtonian and viscoelastic flow models. The Folgar-Tucker Isotropic Rotary Diffusion (IRD) model and the Reduced Strain Closure (RSC) model …
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The production of a lyotropic liquid crystal coated powder precursor through twin screw extrusion.
… extrusion was selected based on the complex viscoelastic flow behaviour of Pluronic F127 solution which was found to be highly temperature sensitive. The Pluronic F127 solution was found to be Newtonian in flow and less viscoelastic at low temperature, such that low temperature (5 C) …
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Controllability of the Stresses in Multimode Viscoelastic Fluid of Upper Convected Maxwell Type
Viscoelastic fluids, or Non-Newtonian fluids, are those that do not have a linear algebraic relation between the velocity field and the stresses arising in the media. Such fluids exhibit properties of both solids and liquids, and therefore cannot be modeled with methods of elasticity or Newtonian …
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Initial Value Problems for Creeping Flow of Maxwell Fluids
We consider the flow of nonlinear Maxwell fluids in the unsteady quasistatic case, where the effect of inertia is neglected. We study the well-posedness of the resulting PDE initial-boundary value problem. This well-posedness depends on the unique solvability of an elliptic boundary value problem. …