Flow birefringence turns out to represent accumulated fluid deformation only when fluids behave like solids with large De, whereas the anisotropy of the microstructures relaxes for small De, diminishing birefringence.
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flow birefringence
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At small Deborah number, microstructural anisotropy relaxes and birefringence diminishes.
Flow birefringence represents accumulated fluid deformation only when fluids behave like solids with large Deborah number.
The paper generalizes flow birefringence evolution by explicitly decomposing microscopic and macroscopic contributions.