Elastic secondary flows in sharp 90 degree micro-bends: a comparison of PEO and DNA solutions
Journal of Rheology
The growth or absence of elastic secondary flows is documented for flows of dilute and semi-dilute polymer solutions in sharp 90° micro-bends in channels of rectangular cross-section; secondary flows are not present for Newtonian flows under similar conditions. Flow visualization shows that a vortex is present in the inner, upstream corner of the bend and grows with increasing Reynolds (Re) and Weissenberg (Wi) numbers for flows of shear-thinning, semi-dilute polymeric solutions containing λ-DNAλ-DNA (9.9×10−7−2, 0.42−4−33.5×10−4−3, 1.8−4−23.3×10−4−2, 1.1
Dutcher, C. S.,
Muller, S. J.
Elastic secondary flows in sharp 90 degree micro-bends: a comparison of PEO and DNA solutions.
Journal of Rheology, 54(2), 375–392.