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    Polymer blends in a contraction-expansion flow.

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    Publication date
    2006
    Author
    Clarke, N.C.
    De Luca, E.
    Bent, J.
    Buxton, G.
    Gough, Timothy D.
    Grillo, I.
    Hutchings, L.R.
    Keyword
    Experimental study
    Modeling
    Lateral distribution
    Longitudinal distribution
    Interaction parameter
    Flow field
    Structure factor
    Concentration fluctuation
    Sudden contraction
    Flow(fluid)
    Styrene(alpha-methyl) polymer
    Polymer blends
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    We have probed the coupling between flow and concentration fluctuations in polymer blends using small-angle neutron scattering. We utilized a recirculating cell with a slot die, enabling us to measure the behavior at the entrance, within and at the exit of a contraction-expansion flow. While, as expected, anisotropy was observed in all nonquiescent experiments, the correlation lengths associated with the concentration fluctuations are found to be "stretched" more in the direction perpendicular to the flow at all positions along the centerline of the flow, except at the slot die exit. To gain insight into the observations, we present calculations of the scattering based on a multiscale approach, which bridges the gap between macroscopic Newtonian fluid dynamics and the convection of nanoscale concentration fluctuations. However, we find that this model contains insufficient physics to correctly describe our observations. Consequently, we argue that the deformation of the correlation length is primarily due to the coupling between weakly non-Newtonian stresses and thermodynamics
    URI
    http://hdl.handle.net/10454/3643
    Version
    No full-text available in the repository
    Citation
    Clarke, N.C., De Luca, E., Bent, J., Buxton, G. and Gough, T.D. et al. (2006). Polymer blends in a contraction-expansion flow. Macromolecules. Vol. 39, No. 22, pp. 7607-7616.
    Link to publisher’s version
    http://dx.doi.org/10.1021/ma0610966
    Type
    Article
    Collections
    Engineering and Informatics Publications

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