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In this paper we investigate the stabilizing effect of pre-deforming the flow of a PEO/PEG Boger fluid before entering a microfabricated 83:1:83 planar contraction–expansion. Applying pre-deformation has a dramatic effect on the size and stability of the recirculation zones upstream of the contraction. This pre-deformation is generated by a cylinder placed in front of the contraction. Transverse flow...
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