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 INNFM_Poster.pdf
In recent years, the University of Wales Institute of Non-Newtonian Fluid Mechanics (UWINNFM) has produced five films on various aspects of Rheology: Non-Newtonian Fluids; History of Rheology; Boger fluids; Complex Fluids in Complex Flows – Extravagant Effects; Yield Stress. Edited versions of these five films are now available on one DVD, (with a total playing time of approximately two and a half hours). Details may be obtained from either Ken Walters (kew@aber.ac.uk) or David Binding (dmb@aber.ac.uk).
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Paper_DGrecov_JRClermont_AERC2007.pdf
Submitted to Rheologica Acta, 2007
NUMERICAL SIMULATIONS OF NON-STATIONARY FLOWS
OF NON-NEWTONIAN FLUIDS
BETWEEN CONCENTRIC AND ECCENTRIC CYLINDERS
BY STREAM-TUBE METHOD AND DOMAIN DECOMPOSITION
by
Dana GRECOV *
Jean-Robert CLERMONT **
* Department of Mechanical Engineering,
University of British Columbia,
2054-6250 Applied Science Lane,
Vancouver, BC, Canada V6T 1Z4
** Laboratoire de Rhéologie
UMR 5520 CNRS - Université Joseph-Fourier
- Institut National Polytechnique de Grenoble
Domaine Universitaire, B.P. No 53,
38041 Grenoble Cedex 9, FRANCE
(**) corresponding author
E-mail: clermont@ujf-grenoble.fr
Tel. : 33+4 76 82 52 92
Fax : 33+4 76 82 51 64
ABSTRACT
This study involves a theoretical formulation of the Stream-Tube Method in non-stationary flows. Initially, this approach allowed flow computations by determining an unknown transformation between the physical domain and a mapped domain where the streamlines are rectilinear and parallel. To take into account vortex zones, we define local transformations of sub-regions of the physical domain that are mapped into rectangular domains where the transformed streamlines are still parallel and straight. The local functions must be determined numerically, from the governing equations and boundary conditions put together with compatibility equations. The method enables to compute streamlines and flow data at every time, using distinguishing properties, as verification of mass conservation and definition of rectangular meshes allowing to adopt finite-difference schemes. The numerical simulations concern different non-Newtonian fluids under various geometrical and kinematic specifications related to flows between concentric and eccentric cylinders, leading to comparisons with literature data. The results also highlight the influence of the rheological properties on the flow characteristics, in unsteady conditions.
Keywords: Unsteady flows, concentric and eccentric cylinders, non-Newtonian fluids, Stream-Tube Method, domain decomposition
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Mechanism_of__diffusion.pdf
The reptation and diffusive modes of motion
of linear macromolecules.
It is shown, that there is a length of macromolecule M 10Me, where
Me is ’the length of the macromolecule between adjacent entanglements’,
above which macromolecules of a melt can be considered as obstacles to
motion of each other, and the macromolecules reptate. The transition to
reptation mode of motion is determined by both topological restrictions and
local anisotropy of motion. The investigation confirms that the reptation motion
determines the molecular-weight dependence of self-diffusion coefficient
of macromolecules in melts as M−2.
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 Update_PSR.doc
New officers of the Portuguese SR
names and contacts + logo
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