In the injection molding, what is the ratio between chain orientation induced tensile stress(due to viscosity gradient in mold), and chain orientation induced shear stress (at the wall)?
Peter Farrington
This is still a hot topic, but recent work suggests that orientation is mostly related to local effects at the wall rather than stagnation at the flow front.
eg. https://doi.org/10.1007/s003970000121
The deformation of the fluid element in your picture is probably misleading.
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