3. Defects associated with multilayer flow
There are two types of defects: those that lead to non-uniformity in layer thickness and those that result in discontinuities due to interface instabilities.
3.1 Non-uniformities
When observing bilayer flow in a channel of constant cross-section, the interface between the two polymers A and B changes between the inlet and outlet cross-sections.
It undergoes a regular transformation that maintains a clear and precise boundary between the two polymers. This transformation results from the superposition of the following two phenomena:
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Coating or encapsulation phenomenon due to the difference in viscosity of the two polymers (figure 3...
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