Modelling Polymers as Compressible Elastic Spheres in Couette Flow

Modelling Polymers as Compressible Elastic Spheres in Couette Flow

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A model of polymer chains as compressible elastic spheres in flow Cookie plate is presented.The spherical polymer blobs are assumed to compress in simple Couette flow in accord with recent rheo-optic measurements on semi-dilute solutions.The experimentally determined decrease in radius Mugs/Cups/Tumblers with increasing shear rate is predicted by the model.Furthermore, the model predicts power law exponents for the viscosity-shear rate within the range of measured values for polymer chains.