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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

The flow of polymeric fluids

Agg, D. A. January 1987 (has links)
The thesis is concerned with the flow of polymeric fluids and their response to deformations. The current state of research into the rheology of polymers is reviewed and an introduction to non-Newtonian fluid mechanics is given. A novel numerical algorithm for simulating the flow of non-Newtonian fluids is presented, in which the fluid is represented by a set of Lagrangian particles embedded in it. Each particle carries a velocity and a stress with it as it moves through the flow geometry. The velocity gradient tensor and the divergence of the stress tensor are calculated for each particle by averaging over the neighbouring particles. The velocity is changed according to a discretised form of the equation of conservation of momentum and the stress is updated according to the constitutive equation for the fluid. Extra algorithms are presented to deal with the boundary conditions. The simulation is used to study the two-dimensional flow of a co-rotational Maxwell fluid past an array of cylinders between two walls. In the second part of the thesis, a computer simulation is developed which will allow the constitutive equation for a polymer melt to be replaced by a numerical version. Previous computer simulations of polymers are reviewed and a new, real space, reptation model is presented. This model is shown to have the correct behaviour for a reptating chain and is used to study the stress response to a step shear deformation. The long-term behaviour agrees with reptation theory, but the short-time behaviour is also found.

Conditional moment closure methods for autoignition problems

Bushe, William Kendal January 1995 (has links)
No description available.

Bulk properties of fluids determined from their microscopic structure

Jansons, K. M. January 1983 (has links)
No description available.

Topics in two-dimensional turbulence and dynamo theory

Gilbert, Andrew David January 1988 (has links)
No description available.

Application of the Boundary Element Method to the detachment, oscillation and interaction of gas bubbles in a fluid

Beton, Christopher William Hartley January 1994 (has links)
No description available.

Applications of boundary integral methods to viscous flows

Kelly, Enda Daniel January 1995 (has links)
No description available.

Lagrangian predictions of particle transport in turbulent round jets

Gheissary, Ghassem January 1990 (has links)
No description available.

Raman studies of plasmons in two-dimensional electron gases

O. Suilleabhain, Liam Colman January 1993 (has links)
No description available.

Buoyancy driven counterflow and interfacial mixing

Kiel, Darwin E. January 1991 (has links)
No description available.

Flow of cohesionless grains in oscillatory fluids

Ahilan, R. V. January 1985 (has links)
No description available.

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