The latter originates from the relaxation of the microscopic structures, characterized by the Deborah number De, which is a dimensionless number that compares the material's relaxation time and the characteristic time of the applied deformation process.
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Deborah number
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De
Evidence Snippets
Supporting Sources
Linked Claims
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.
Failure of the stress-optic law in unsteady flows originates from relaxation of microscopic structures and depends on the Deborah number.