High-Deborah-number flows of dilute polymer solutions
OG Harlen, JM Rallison, MD Chilcott - Journal of non-newtonian fluid …, 1990 - Elsevier
A boundary layer approximation is developed for the steady flow of dilute polymer solutions
at high Deborah numbers. In a class of such flows polymer molecules are most highly
extended in narrow strands downstream of stagnation points, as only those molecules that
pass close to a stagnation point reside in the flow long enough to become significantly
extended. This structure can be seen from optical experiments {1–8} where the strands of
extended polymer appear as bright birefringent lines while the rest of the fluid appears dark …
at high Deborah numbers. In a class of such flows polymer molecules are most highly
extended in narrow strands downstream of stagnation points, as only those molecules that
pass close to a stagnation point reside in the flow long enough to become significantly
extended. This structure can be seen from optical experiments {1–8} where the strands of
extended polymer appear as bright birefringent lines while the rest of the fluid appears dark …
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