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Which outcome can shear rate promote in polymer melts?

A)Onset of turbulent secondary flows
B)Isothermal conditions prevail indefinitely
C)Increased polymer chain entanglement
D)Perfectly laminar homogeneous deformation

💡 Explanation

The onset of *turbulence* appears because shear instabilities cause secondary flows, therefore, mixing increases; rather than remaining laminar, which requires lower Reynolds numbers than the current polymer configuration, viscosity profile and rate promote.

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