Elastic secondary flows in sharp 90 degree micro-bends: a comparison of PEO and DNA solutions

Authors

Shelly Gulati, University of California, BerkeleyFollow
C. S. Dutcher, University of California, Berkeley
Dorian Liepmann, University of California, Berkeley
Susan J. Muller, University of California, Berkeley

Department

Bioengineering

Document Type

Article

Publication Title

Journal of Rheology

ISSN

0148-6055

Volume

54

Issue

2

DOI

10.1122/1.3308643

First Page

375

Last Page

392

Publication Date

3-1-2010

Abstract

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

Recommended Citation

Gulati, S., Dutcher, C. S., Liepmann, D., & Muller, S. J. (2010). Elastic secondary flows in sharp 90 degree micro-bends: a comparison of PEO and DNA solutions. Journal of Rheology, 54(2), 375–392. DOI: 10.1122/1.3308643
https://scholarlycommons.pacific.edu/soecs-facarticles/48